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//===-- tsan_rtl_mutex.cc -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "tsan_rtl.h"
#include "tsan_sync.h"
#include "tsan_report.h"
#include "tsan_symbolize.h"
namespace __tsan {
void MutexCreate(ThreadState *thr, uptr pc, uptr addr,
bool rw, bool recursive) {
Context *ctx = CTX();
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexCreate %zx\n", thr->tid, addr);
StatInc(thr, StatMutexCreate);
MemoryWrite1Byte(thr, pc, addr);
SyncVar *s = ctx->synctab.GetAndLock(thr, pc, addr, true);
s->is_rw = rw;
s->is_recursive = recursive;
s->mtx.Unlock();
}
void MutexDestroy(ThreadState *thr, uptr pc, uptr addr) {
Context *ctx = CTX();
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexDestroy %zx\n", thr->tid, addr);
StatInc(thr, StatMutexDestroy);
MemoryWrite1Byte(thr, pc, addr);
SyncVar *s = ctx->synctab.GetAndRemove(thr, pc, addr);
if (s == 0)
return;
if (s->owner_tid != SyncVar::kInvalidTid && !s->is_broken) {
s->is_broken = true;
ScopedReport rep(ReportTypeMutexDestroyLocked);
rep.AddMutex(s);
rep.AddLocation(s->addr, 1);
OutputReport(rep);
}
DestroyAndFree(s);
}
void MutexLock(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexLock %zx\n", thr->tid, addr);
MemoryRead1Byte(thr, pc, addr);
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeLock, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
if (s->owner_tid == SyncVar::kInvalidTid) {
CHECK_EQ(s->recursion, 0);
s->owner_tid = thr->tid;
} else if (s->owner_tid == thr->tid) {
CHECK_GT(s->recursion, 0);
} else {
TsanPrintf("ThreadSanitizer WARNING: double lock\n");
}
if (s->recursion == 0) {
StatInc(thr, StatMutexLock);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->clock.acquire(&s->clock);
StatInc(thr, StatSyncAcquire);
thr->clock.acquire(&s->read_clock);
StatInc(thr, StatSyncAcquire);
} else if (!s->is_recursive) {
StatInc(thr, StatMutexRecLock);
}
s->recursion++;
s->mtx.Unlock();
}
void MutexUnlock(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexUnlock %zx\n", thr->tid, addr);
MemoryRead1Byte(thr, pc, addr);
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeUnlock, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
if (s->recursion == 0) {
if (!s->is_broken) {
s->is_broken = true;
TsanPrintf("ThreadSanitizer WARNING: unlock of unlocked mutex\n");
}
} else if (s->owner_tid != thr->tid) {
if (!s->is_broken) {
s->is_broken = true;
TsanPrintf("ThreadSanitizer WARNING: mutex unlock by another thread\n");
}
} else {
s->recursion--;
if (s->recursion == 0) {
StatInc(thr, StatMutexUnlock);
s->owner_tid = SyncVar::kInvalidTid;
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->fast_synch_epoch = thr->fast_state.epoch();
thr->clock.release(&s->clock);
StatInc(thr, StatSyncRelease);
} else {
StatInc(thr, StatMutexRecUnlock);
}
}
s->mtx.Unlock();
}
void MutexReadLock(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexReadLock %zx\n", thr->tid, addr);
StatInc(thr, StatMutexReadLock);
MemoryRead1Byte(thr, pc, addr);
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeRLock, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, false);
if (s->owner_tid != SyncVar::kInvalidTid)
TsanPrintf("ThreadSanitizer WARNING: read lock of a write locked mutex\n");
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->clock.acquire(&s->clock);
StatInc(thr, StatSyncAcquire);
s->mtx.ReadUnlock();
}
void MutexReadUnlock(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexReadUnlock %zx\n", thr->tid, addr);
StatInc(thr, StatMutexReadUnlock);
MemoryRead1Byte(thr, pc, addr);
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeRUnlock, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
if (s->owner_tid != SyncVar::kInvalidTid)
TsanPrintf("ThreadSanitizer WARNING: read unlock of a write "
"locked mutex\n");
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->fast_synch_epoch = thr->fast_state.epoch();
thr->clock.release(&s->read_clock);
StatInc(thr, StatSyncRelease);
s->mtx.Unlock();
}
void MutexReadOrWriteUnlock(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: MutexReadOrWriteUnlock %zx\n", thr->tid, addr);
MemoryRead1Byte(thr, pc, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
if (s->owner_tid == SyncVar::kInvalidTid) {
// Seems to be read unlock.
StatInc(thr, StatMutexReadUnlock);
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeRUnlock, addr);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->fast_synch_epoch = thr->fast_state.epoch();
thr->clock.release(&s->read_clock);
StatInc(thr, StatSyncRelease);
} else if (s->owner_tid == thr->tid) {
// Seems to be write unlock.
CHECK_GT(s->recursion, 0);
s->recursion--;
if (s->recursion == 0) {
StatInc(thr, StatMutexUnlock);
s->owner_tid = SyncVar::kInvalidTid;
// FIXME: Refactor me, plz.
// The sequence of events is quite tricky and doubled in several places.
// First, it's a bug to increment the epoch w/o writing to the trace.
// Then, the acquire/release logic can be factored out as well.
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeUnlock, addr);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->fast_synch_epoch = thr->fast_state.epoch();
thr->clock.release(&s->clock);
StatInc(thr, StatSyncRelease);
} else {
StatInc(thr, StatMutexRecUnlock);
}
} else if (!s->is_broken) {
s->is_broken = true;
TsanPrintf("ThreadSanitizer WARNING: mutex unlock by another thread\n");
}
s->mtx.Unlock();
}
void Acquire(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: Acquire %zx\n", thr->tid, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, false);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->clock.acquire(&s->clock);
StatInc(thr, StatSyncAcquire);
s->mtx.ReadUnlock();
}
void Release(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: Release %zx\n", thr->tid, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->clock.release(&s->clock);
StatInc(thr, StatSyncRelease);
s->mtx.Unlock();
}
void ReleaseStore(ThreadState *thr, uptr pc, uptr addr) {
CHECK_GT(thr->in_rtl, 0);
DPrintf("#%d: ReleaseStore %zx\n", thr->tid, addr);
SyncVar *s = CTX()->synctab.GetAndLock(thr, pc, addr, true);
thr->clock.set(thr->tid, thr->fast_state.epoch());
thr->clock.ReleaseStore(&s->clock);
StatInc(thr, StatSyncRelease);
s->mtx.Unlock();
}
} // namespace __tsan
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