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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET1/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
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Uczeń odróżnia mutex od semafora binarnego i dowodzi, że FreeRTOS tymczasowo podnosi efektywny priorytet właściciela blokującego task o wyższym priorytecie.

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Low p1 przejmuje mutex i tworzy High p3. High blokuje się bez timeoutu, Low dziedziczy p3, a nowy Medium p2 pozostaje Ready bez wykonania. Po give High przejmuje zasób przed Medium, a Low wraca do p1. Verifier sprawdza publiczne API, własność, trzy stosy, porządek E01–E10 i stabilny digest.

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ownership, bounded inversion i priority inheritance

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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET2/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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", "content_html": "", "tasks": [], "assets": [ { "label": "fig:a2-structure", "logical_label": "fig:a2-structure", "figure_number": 1, "caption": "A2 STRUCTURE — ownership i wait list. — część 1/1 (r1 c1)", "alt": "Struktura mutexu i trzech tasków.", "href": "figures/a2-structure.svg", "source_href": "figures/a2-structure.puml", "width": 1.0, "kind": "diagram", "interactive": { "kind": "uml-class", "storage_key": "fc08-a2-structure-tile-1", "title": "A2 · struktura mutexu", "task": { "id": "task01", "label": "Task01 · mutex i PIP" }, "block": { "id": "a2", "label": "A2 STRUCTURE", "description": "Genuine mutex, owner, waiter, Ready task and guarded resource." }, "phases": [ { "id": "structure", "label": "MUTEX / OWNER / WAITERS", "steps": [ { "id": "mutex", "number": 1, "label": "genuine FreeRTOS mutex", "mode": "CODE", "strategy_ref": "code.contract", "svg_label": "01", "code_ref": "src/tasks/task01_mutex.c:237", "description": "xSemaphoreCreateMutex wybiera mechanizm ownership/PIP.", "evidence": "xQueueCreateMutex symbol.", "strategy": { "id": "task01/a2/structure/mutex", "kind": "code", "action": "open", "expected_observations": [ "genuine mutex API", "brak vTaskPrioritySet" ], "assertions": [ "one mutex", "fixed p1/p2/p3" ], "evidence_fields": [ "code_ref", "API", "priority" ], "prerequisites": [ "źródło FC08" ], "layout": [ "FreeRTOSConfig", "MutexExperiment", "task priorities" ], "commands": [ "rg -n 'configUSE_MUTEXES|xSemaphore|uxTaskPriorityGet' include src" ], "template_id": "code.contract" } }, { "id": "low", "number": 2, "label": "Low owns protected value", "mode": "RUN", "event_id": "E02", "strategy_ref": "run.inheritance", "svg_label": "02", "code_ref": "src/tasks/task01_mutex.c:142", "snapshot_ref": "task01.low-owns", "description": "Take z zerowym wait jest legalny dla wolnego mutexu.", "evidence": "holder Low; value 1.", "strategy": { "id": "task01/a2/structure/low", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "high", "number": 3, "label": "High waits indefinitely", "mode": "RUN", "event_id": "E03", "strategy_ref": "run.inheritance", "svg_label": "03", "code_ref": "src/tasks/task01_mutex.c:97", "snapshot_ref": "task01.high-blocks", "description": "High trafia na mutex wait list.", "evidence": "High stack and Blocked path.", "strategy": { "id": "task01/a2/structure/high", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "medium", "number": 4, "label": "Medium is Ready, not executed", "mode": "RUN", "event_id": "E05", "strategy_ref": "run.inheritance", "svg_label": "04", "code_ref": "src/tasks/task01_mutex.c:160", "snapshot_ref": "task01.medium-ready", "description": "P2 nie wyprzedza odziedziczonego p3.", "evidence": "eReady; started=0.", "strategy": { "id": "task01/a2/structure/medium", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "resource", "number": 5, "label": "all writes occur under ownership", "mode": "RUN", "event_id": "E07", "strategy_ref": "run.handoff", "svg_label": "05", "code_ref": "src/tasks/task01_mutex.c:101", "snapshot_ref": "task01.high-acquires", "description": "High zapisuje 2 po przejęciu mutexu.", "evidence": "protected_value=2.", "strategy": { "id": "task01/a2/structure/resource", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } } ] } ] }, "tile": { "index": 1, "count": 1, "row": 1, "column": 1, "rows": 1, "columns": 1, "x": 0.0, "y": 0.0, "width": 475.0, "height": 529.0, "full_x": 0.0, "full_y": 0.0, "full_width": 475.0, "full_height": 529.0, "page_width": 660.0, "page_height": 760.0, "overview": true, "step_ids": [ "high", "low", "medium", "mutex", "resource" ] }, "diagram_title": "A2 · struktura mutexu", "diagram_block_label": "A2 STRUCTURE", "diagram_description": "Genuine mutex, owner, waiter, Ready task and guarded resource.", "diagram_phase_labels": [ "MUTEX / OWNER / WAITERS" ] } ], "steps": [], "spread_group": "", "spread_label": "A2 STRUCTURE — ownership i wait list.", "spread_columns": 1, "spread_index": 1, "spread_count": 1, "page_orientation": "portrait" }, { "id": "section-2-content", "index": 2, "title": "A4 — Application", "show_heading": false, "toc_entry": true, "header_html": "
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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET3/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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", "content_html": "", "tasks": [], "assets": [ { "label": "fig:a4-application", "logical_label": "fig:a4-application", "figure_number": 2, "caption": "A4 APPLICATION — deterministic creation topology. — część 1/1 (r1 c1)", "alt": "Topologia Low, High, Medium i verifier.", "href": "figures/a4-application.svg", "source_href": "figures/a4-application.puml", "width": 1.0, "kind": "diagram", "interactive": { "kind": "uml-class", "storage_key": "fc08-a4-application-tile-1", "title": "A4 · topologia eksperymentu", "task": { "id": "task01", "label": "Task01 · mutex i PIP" }, "block": { "id": "a4", "label": "A4 APPLICATION", "description": "Construction order makes inheritance observable without timing guesses." }, "phases": [ { "id": "topology", "label": "CREATE / BLOCK / VERIFY", "steps": [ { "id": "main", "number": 1, "label": "main creates only Low and verifier", "mode": "CODE", "strategy_ref": "code.contract", "svg_label": "01", "code_ref": "src/tasks/task01_mutex.c:233", "description": "High nie może przejąć wolnego mutexu przed Low.", "evidence": "fixed topology.", "strategy": { "id": "task01/a4/topology/main", "kind": "code", "action": "open", "expected_observations": [ "genuine mutex API", "brak vTaskPrioritySet" ], "assertions": [ "one mutex", "fixed p1/p2/p3" ], "evidence_fields": [ "code_ref", "API", "priority" ], "prerequisites": [ "źródło FC08" ], "layout": [ "FreeRTOSConfig", "MutexExperiment", "task priorities" ], "commands": [ "rg -n 'configUSE_MUTEXES|xSemaphore|uxTaskPriorityGet' include src" ], "template_id": "code.contract" } }, { "id": "low", "number": 2, "label": "Low creates High while owning", "mode": "RUN", "event_id": "E02", "strategy_ref": "run.inheritance", "svg_label": "02", "code_ref": "src/tasks/task01_mutex.c:149", "snapshot_ref": "task01.low-owns", "description": "High natychmiast preemptuje i blokuje się.", "evidence": "next event E03.", "strategy": { "id": "task01/a4/topology/low", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "high", "number": 3, "label": "High creates contention", "mode": "RUN", "event_id": "E03", "strategy_ref": "run.inheritance", "svg_label": "03", "code_ref": "src/tasks/task01_mutex.c:96", "snapshot_ref": "task01.high-blocks", "description": "Nie ma sztucznej zmiany priorytetu.", "evidence": "real mutex wait.", "strategy": { "id": "task01/a4/topology/high", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "inherited", "number": 4, "label": "Low continues at effective p3", "mode": "RUN", "event_id": "E04", "strategy_ref": "run.inheritance", "svg_label": "04", "code_ref": "src/tasks/task01_mutex.c:152", "snapshot_ref": "task01.inherited", "description": "Public API zwraca 3.", "evidence": "holder remains Low.", "strategy": { "id": "task01/a4/topology/inherited", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "medium", "number": 5, "label": "Medium is the inversion probe", "mode": "RUN", "event_id": "E05", "strategy_ref": "run.inheritance", "svg_label": "05", "code_ref": "src/tasks/task01_mutex.c:162", "snapshot_ref": "task01.medium-ready", "description": "Ready p2 nie wykonuje nawet pierwszej instrukcji.", "evidence": "started=0.", "strategy": { "id": "task01/a4/topology/medium", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "verifier", "number": 6, "label": "lowest verifier asserts relations", "mode": "RUN", "event_id": "E10", "strategy_ref": "run.pass", "svg_label": "06", "code_ref": "src/tasks/task01_mutex.c:207", "snapshot_ref": "task01.pass", "description": "Sprawdzenie nie zakłóca workerów.", "evidence": "PASS and digest.", "strategy": { "id": "task01/a4/topology/verifier", "kind": "run", "action": "replay", "expected_observations": [ "PASS=1", "10 committed records" ], "assertions": [ "stable three-run digest", "verifier priority 0" ], "evidence_fields": [ "PASS", "digest", "source blob", "ELF hash", "timestamp" ], "prerequisites": [ "three workers finished" ], "layout": [ "bounded log", "PASS", "digest" ], "commands": [ "print g_fc08_pass", "print g_fc08.evidence_digest" ], "template_id": "run.pass" } } ] } ] }, "tile": { "index": 1, "count": 1, "row": 1, "column": 1, "rows": 1, "columns": 1, "x": 0.0, "y": 0.0, "width": 311.0, "height": 706.0, "full_x": 0.0, "full_y": 0.0, "full_width": 311.0, "full_height": 706.0, "page_width": 660.0, "page_height": 760.0, "overview": true, "step_ids": [ "high", "inherited", "low", "main", "medium", "verifier" ] }, "diagram_title": "A4 · topologia eksperymentu", "diagram_block_label": "A4 APPLICATION", "diagram_description": "Construction order makes inheritance observable without timing guesses.", "diagram_phase_labels": [ "CREATE / BLOCK / VERIFY" ] } ], "steps": [], "spread_group": "", "spread_label": "A4 APPLICATION — deterministic creation topology.", "spread_columns": 1, "spread_index": 1, "spread_count": 1, "page_orientation": "portrait" }, { "id": "section-3-content", "index": 3, "title": "A5 — Flow", "show_heading": false, "toc_entry": true, "header_html": "
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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET4/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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"one record.", "strategy": { "id": "task01/a5/flow/config", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "own", "number": 2, "label": "Low takes mutex", "mode": "RUN", "event_id": "E02", "strategy_ref": "run.inheritance", "svg_label": "02", "code_ref": "src/tasks/task01_mutex.c:142", "snapshot_ref": "task01.low-owns", "description": "Low becomes owner.", "evidence": "value=1.", "strategy": { "id": "task01/a5/flow/own", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "block", "number": 3, "label": "High blocks", "mode": "RUN", "event_id": "E03", "strategy_ref": "run.inheritance", "svg_label": "03", "code_ref": "src/tasks/task01_mutex.c:97", "snapshot_ref": "task01.high-blocks", "description": "Non-zero wait creates contention.", "evidence": "High stack.", "strategy": { "id": "task01/a5/flow/block", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "inherit", "number": 4, "label": "Low inherits p3", "mode": "RUN", "event_id": "E04", "strategy_ref": "run.inheritance", "svg_label": "04", "code_ref": "src/tasks/task01_mutex.c:152", "snapshot_ref": "task01.inherited", "description": "Kernel PIP, not application code.", "evidence": "priority=3.", "strategy": { "id": "task01/a5/flow/inherit", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "ready", "number": 5, "label": "Medium Ready but not run", "mode": "RUN", "event_id": "E05", "strategy_ref": "run.inheritance", "svg_label": "05", "code_ref": "src/tasks/task01_mutex.c:162", "snapshot_ref": "task01.medium-ready", "description": "Bounded inversion proof.", "evidence": "eReady and zero flag.", "strategy": { "id": "task01/a5/flow/ready", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "give", "number": 6, "label": "Low begins give", "mode": "RUN", "event_id": "E06", "strategy_ref": "run.handoff", "svg_label": "06", "code_ref": "src/tasks/task01_mutex.c:169", "snapshot_ref": "task01.release", "description": "High may preempt inside API.", "evidence": "value still 1.", "strategy": { "id": "task01/a5/flow/give", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } }, { "id": "high", "number": 7, "label": "High acquires first", "mode": "RUN", "event_id": "E07", "strategy_ref": "run.handoff", "svg_label": "07", "code_ref": "src/tasks/task01_mutex.c:101", "snapshot_ref": "task01.high-acquires", "description": "Ownership transfers to top waiter.", "evidence": "value=2.", "strategy": { "id": "task01/a5/flow/high", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } }, { "id": "medium", "number": 8, "label": "Medium runs after High", "mode": "RUN", "event_id": "E08", "strategy_ref": "run.handoff", "svg_label": "08", "code_ref": "src/tasks/task01_mutex.c:123", "snapshot_ref": "task01.medium-runs", "description": "No priority inversion remains.", "evidence": "E07 before E08.", "strategy": { "id": "task01/a5/flow/medium", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } }, { "id": "restore", "number": 9, "label": "Low returns to base p1", "mode": "RUN", "event_id": "E09", "strategy_ref": "run.handoff", "svg_label": "09", "code_ref": "src/tasks/task01_mutex.c:175", "snapshot_ref": "task01.restored", "description": "Disinherit after give.", "evidence": "priority=1.", "strategy": { "id": "task01/a5/flow/restore", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } }, { "id": "pass", "number": 10, "label": "verifier commits PASS", "mode": "RUN", "event_id": "E10", "strategy_ref": "run.pass", "svg_label": "10", "code_ref": "src/tasks/task01_mutex.c:207", "snapshot_ref": "task01.pass", "description": "All relational assertions hold.", "evidence": "digest 5433b784.", "strategy": { "id": "task01/a5/flow/pass", "kind": "run", "action": "replay", "expected_observations": [ "PASS=1", "10 committed records" ], "assertions": [ "stable three-run digest", "verifier priority 0" ], "evidence_fields": [ "PASS", "digest", "source blob", "ELF hash", "timestamp" ], "prerequisites": [ "three workers finished" ], "layout": [ "bounded log", "PASS", "digest" ], "commands": [ "print g_fc08_pass", "print g_fc08.evidence_digest" ], "template_id": "run.pass" } } ] } ] }, "tile": { "index": 1, "count": 1, "row": 1, "column": 1, "rows": 1, "columns": 1, "x": 0.0, "y": 0.0, "width": 606.0, "height": 541.0, "full_x": 0.0, "full_y": 0.0, "full_width": 606.0, "full_height": 541.0, "page_width": 660.0, "page_height": 760.0, "overview": true, "step_ids": [ "block", "config", "give", "high", "inherit", "medium", "own", "pass", "ready", "restore" ] }, "diagram_title": "A5 · priority inheritance flow", "diagram_block_label": "A5 FLOW", "diagram_description": "One complete E01–E10 run.", "diagram_phase_labels": [ "OWN / INHERIT / HANDOFF / RESTORE" ] } ], "steps": [], "spread_group": "", "spread_label": "A5 FLOW — bounded priority inversion.", "spread_columns": 1, "spread_index": 1, "spread_count": 1, "page_orientation": "portrait" }, { "id": "section-4-content", "index": 4, "title": "A6 — State", "show_heading": false, "toc_entry": true, "header_html": "
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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET5/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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", "content_html": "", "tasks": [], "assets": [ { "label": "fig:a6-state", "logical_label": "fig:a6-state", "figure_number": 4, "caption": "A6 STATE — free, owned, contended, transferred. — część 1/1 (r1 c1)", "alt": "Maszyna stanu mutexu.", "href": "figures/a6-state.svg", "source_href": "figures/a6-state.puml", "width": 1.0, "kind": "diagram", "interactive": { "kind": "uml-class", "storage_key": "fc08-a6-state-tile-1", "title": "A6 · owner and priority state", "task": { "id": "task01", "label": "Task01 · mutex i PIP" }, "block": { "id": "a6", "label": "A6 STATE", "description": "Mutex ownership and effective-priority states." }, "phases": [ { "id": "state", "label": "FREE / OWNED / CONTENDED / TRANSFERRED", "steps": [ { "id": "free", "number": 1, "label": "mutex starts free", "mode": "RUN", "event_id": "E01", "strategy_ref": "run.inheritance", "svg_label": "01", "code_ref": "src/tasks/task01_mutex.c:237", "snapshot_ref": "task01.config", "description": "No owner.", "evidence": "handle created after E01.", "strategy": { "id": "task01/a6/state/free", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "owned", "number": 2, "label": "Low owns at p1", "mode": "RUN", "event_id": "E02", "strategy_ref": "run.inheritance", "svg_label": "02", "code_ref": "src/tasks/task01_mutex.c:142", "snapshot_ref": "task01.low-owns", "description": "Uncontended state.", "evidence": "protected value 1.", "strategy": { "id": "task01/a6/state/owned", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "contended", "number": 3, "label": "High waits; Low effective p3", "mode": "RUN", "event_id": "E04", "strategy_ref": "run.inheritance", "svg_label": "03", "code_ref": "src/tasks/task01_mutex.c:152", "snapshot_ref": "task01.inherited", "description": "Owner stays Low.", "evidence": "priority 3, holder Low.", "strategy": { "id": "task01/a6/state/contended", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "transfer", "number": 6, "label": "give transfers to High", "mode": "RUN", "event_id": "E07", "strategy_ref": "run.handoff", "svg_label": "06", "code_ref": "src/tasks/task01_mutex.c:103", "snapshot_ref": "task01.high-acquires", "description": "High returns from take.", "evidence": "value 2.", "strategy": { "id": "task01/a6/state/transfer", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } }, { "id": "verified", "number": 9, "label": "Low is restored", "mode": "RUN", "event_id": "E09", "strategy_ref": "run.handoff", "svg_label": "09", "code_ref": "src/tasks/task01_mutex.c:175", "snapshot_ref": "task01.restored", "description": "Effective equals base again.", "evidence": "priority 1.", "strategy": { "id": "task01/a6/state/verified", "kind": "run", "action": "replay", "expected_observations": [ "High E07 before Medium E08", "value 2 under High ownership" ], "assertions": [ "Low restored to 1", "resource invariant" ], "evidence_fields": [ "order", "priority", "value" ], "prerequisites": [ "Low owns contended mutex" ], "layout": [ "give path", "High", "Medium", "protected value" ], "commands": [ "print g_fc08.protected_value", "print g_fc08_events[6]", "print g_fc08_events[7]" ], "template_id": "run.handoff" } } ] } ] }, "tile": { "index": 1, "count": 1, "row": 1, "column": 1, "rows": 1, "columns": 1, "x": 0.0, "y": 0.0, "width": 403.0, "height": 605.0, "full_x": 0.0, "full_y": 0.0, "full_width": 403.0, "full_height": 605.0, "page_width": 660.0, "page_height": 760.0, "overview": true, "step_ids": [ "contended", "free", "owned", "transfer", "verified" ] }, "diagram_title": "A6 · owner and priority state", "diagram_block_label": "A6 STATE", "diagram_description": "Mutex ownership and effective-priority states.", "diagram_phase_labels": [ "FREE / OWNED / CONTENDED / TRANSFERRED" ] } ], "steps": [], "spread_group": "", "spread_label": "A6 STATE — free, owned, contended, transferred.", "spread_columns": 1, "spread_index": 1, "spread_count": 1, "page_orientation": "portrait" }, { "id": "section-5-content", "index": 5, "title": "A7 — Runtime", "show_heading": false, "toc_entry": true, "header_html": "
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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET6/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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"evidence": "handles and observations.", "strategy": { "id": "task01/a7/runtime/experiment", "kind": "code", "action": "open", "expected_observations": [ "genuine mutex API", "brak vTaskPrioritySet" ], "assertions": [ "one mutex", "fixed p1/p2/p3" ], "evidence_fields": [ "code_ref", "API", "priority" ], "prerequisites": [ "źródło FC08" ], "layout": [ "FreeRTOSConfig", "MutexExperiment", "task priorities" ], "commands": [ "rg -n 'configUSE_MUTEXES|xSemaphore|uxTaskPriorityGet' include src" ], "template_id": "code.contract" } }, { "id": "low", "number": 2, "label": "Low handle remains forensic identity", "mode": "RUN", "event_id": "E04", "strategy_ref": "run.inheritance", "svg_label": "02", "code_ref": "src/tasks/task01_mutex.c:153", "snapshot_ref": "task01.inherited", "description": "Holder compares to saved handle.", "evidence": "SP and priority.", "strategy": { "id": "task01/a7/runtime/low", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "high", "number": 3, "label": "High owns distinct stack", "mode": "RUN", "event_id": "E03", "strategy_ref": "run.inheritance", "svg_label": "03", "code_ref": "src/tasks/task01_mutex.c:95", "snapshot_ref": "task01.high-blocks", "description": "Blocked task preserves context.", "evidence": "high_sp.", "strategy": { "id": "task01/a7/runtime/high", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "medium", "number": 4, "label": "Medium state is public eReady", "mode": "RUN", "event_id": "E05", "strategy_ref": "run.inheritance", "svg_label": "04", "code_ref": "src/tasks/task01_mutex.c:162", "snapshot_ref": "task01.medium-ready", "description": "No private TCB dependency.", "evidence": "eTaskGetState.", "strategy": { "id": "task01/a7/runtime/medium", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "tcb", "number": 5, "label": "TCB base/effective is debugger evidence", "mode": "RUN", "event_id": "E04", "strategy_ref": "run.inheritance", "svg_label": "05", "code_ref": "vendor/FreeRTOS-Kernel/tasks.c:1000", "snapshot_ref": "task01.inherited", "description": "Inspect uxBasePriority and uxPriority only in GDB.", "evidence": "1 and 3.", "strategy": { "id": "task01/a7/runtime/tcb", "kind": "run", "action": "replay", "expected_observations": [ "Low effective=3", "Medium Ready and not started" ], "assertions": [ "holder=Low", "High uses portMAX_DELAY" ], "evidence_fields": [ "event", "holder", "priority", "state", "PC", "SP", "timestamp" ], "prerequisites": [ "Hazard3 online", "czysta RAM" ], "layout": [ "Low/High/Medium", "mutex holder", "task states", "event log" ], "commands": [ "print g_fc08", "print g_fc08_events" ], "template_id": "run.inheritance" } }, { "id": "log", "number": 6, 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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET7/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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TITLEMutex i dziedziczenie priorytetu
VER.v00.01
DATETIME2026-07-19T00:00:00+02:00
PROJECTFreestanding C nad FreeRTOS
SERIESFreeRTOS C
CARD08/15
SHEET8/8
SUBJ.Inf.
PROG.—
CORE—
SCOPE—
LEVEL—
POS.—
GITEA UUIDb408a0e1-ca9f-52b8-9075-ff324bfce778CARD UUID2392f81a-ed6c-510b-86b5-06c5e2f1c6aaAUTHOR  M. Pabiszczak
GITEA  https://zsl-gitea.mpabi.pl/edu-freertos-c/lab-rv32i-freertos-c-resource-management
HTML  https://dce7fb9d-7b2f-5d49-96a2-3a30d3070b84.mpabi.pl/2392f81a-ed6c-510b-86b5-06c5e2f1c6aa
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TECH
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OG
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", "content_html": "", "tasks": [ { "ref": "task01", "title": "Low/Medium/High: ownership i dziedziczenie priorytetu", "uuid": "2392f81a-ed6c-510b-86b5-06c5e2f1c6aa", "criterion": "PASS; Low 1→3→1; Medium eReady i started=0 podczas dziedziczenia; High E07 przed Medium E08; digest jest deterministyczny.", "conclusion_html": "

Mutex rozwiązuje bounded priority inversion przez tymczasowe podniesienie efektywnego priorytetu właściciela. Give może uruchomić High wewnątrz API, zanim kod Low wykona następną instrukcję.

", "prompt_html": "

Przejdź po A2, A4, A5, A6, A7 i A8. Odtwórz E01–E10 i udowodnij, że task średni nie wyprzedza właściciela z odziedziczonym p3.

", "flow": [ { "id": "predict", "kind": "block", "title": "A — kontrakt i przewidywanie", "content_html": "

Rozpisz owner, wait list i priorytety p1/p2/p3.

", "steps": [ { "id": "order", "title": "Przewidź E03–E08.", "content_html": "

Wskaż, kiedy Medium może wykonać pierwszą instrukcję.

" }, { "id": "api", "title": "Odrzuć fałszywe zamienniki.", "content_html": "

Wyjaśnij, dlaczego semafor binarny i vTaskPrioritySet nie dowodzą PIP.

" } ] }, { "id": "replay", "kind": "block", "title": "B — replay Hazard3", "content_html": "

Każdy RUN zaczyna się od czystej RAM.

", "steps": [ { "id": "inherit", "title": "Zbadaj E02–E05.", "content_html": "

Porównaj holder, priority, eReady i started.

" }, { "id": "handoff", "title": "Zbadaj E06–E09.", "content_html": "

Sprawdź High-before-Medium i przywrócenie p1.

" }, { "id": "pass", "title": "Zbadaj E10.", "content_html": "

Zapisz PASS, trzy SP i digest.

" } ] }, { "id": "lock-order", "kind": "exercise", "title": "Ćwiczenie — dwie blokady", "content_html": "", "steps": [] } ] } ], "assets": [], "steps": [], "spread_group": "", "spread_label": "", "spread_columns": 1, "spread_index": 1, "spread_count": 1, "page_orientation": "portrait" } ], "viewpoints": [ { "id": "A1", "label": "CONTEXT", "subtitle": "Granice systemu", "status": "unavailable", "reason": "Granica aplikacja–kernel–Hazard3 jest utrwalona w FC07.", "target_id": "" }, { "id": "A2", "label": "STRUCTURE", "subtitle": "Mutex, owner, wait list i zasób", "status": "enabled", "target_label": "fig:a2-structure", "target_id": "fig-a2-structure" }, { "id": "A3", "label": "DISPATCH", "subtitle": "Binding", "status": "unavailable", "reason": "FC08 nie wprowadza callbacku ani granicy ISR.", "target_id": "" }, { "id": "A4", "label": "APPLICATION", "subtitle": "Low, Medium, High i verifier", "status": "enabled", "target_label": "fig:a4-application", "target_id": "fig-a4-application" }, { "id": "A5", "label": "FLOW", "subtitle": "E01–E10 i handoff mutexu", "status": "enabled", "target_label": "fig:a5-flow", "target_id": "fig-a5-flow" }, { "id": "A6", "label": "STATE", "subtitle": "Owner, waiter i effective priority", "status": "enabled", "target_label": "fig:a6-state", "target_id": "fig-a6-state" }, { "id": "A7", "label": "RUNTIME", "subtitle": "Handle, TCB, stos i event log", "status": "enabled", "target_label": "fig:a7-runtime", "target_id": "fig-a7-runtime" }, { "id": "A8", "label": "PATTERNS", "subtitle": "Critical, suspend, mutex, gatekeeper", "status": "enabled", "target_label": "fig:a8-patterns", "target_id": "fig-a8-patterns" } ], "has_spread": false, "has_allocator_model": false, "dictionary": null, "toc": [ { "id": "section-1-content", "label": "1. A2 — Structure" }, { "id": "section-2-content", "label": "2. A4 — Application" }, { "id": "section-3-content", "label": "3. A5 — Flow" }, { "id": "section-4-content", "label": "4. A6 — State" }, { "id": "section-5-content", "label": "5. A7 — Runtime" }, { "id": "section-6-content", "label": "6. A8 — Patterns" }, { "id": "section-7-task01", "label": "7. Task01 — mutex i PIP" } ] }