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Kernel: Clean up sys$futex and add support for cross-process futexes

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This commit is contained in:
Idan Horowitz 2022-07-14 01:25:35 +03:00 • committed by Andreas Kling
parent 55c7496200
commit 9db10887a1
9 changed files with 164 additions and 70 deletions
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6
Userland/Libraries/LibC/pthread.cpp
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@ -655,7 +655,7 @@ static int rwlock_rdlock_maybe_timed(u32* lockp, const struct timespec* timeout
// Seems like someone is writing (or is interested in writing and we let them have the lock)
// wait until they're done.
auto rc = futex(lockp, FUTEX_WAIT_BITSET, current, timeout, nullptr, reader_wake_mask);
auto rc = futex(lockp, FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG, current, timeout, nullptr, reader_wake_mask);
if (rc < 0 && errno == ETIMEDOUT && timeout) {
return value_if_timeout;
}
@ -703,7 +703,7 @@ static int rwlock_wrlock_maybe_timed(pthread_rwlock_t* lockval_p, const struct t
// Seems like someone is writing (or is interested in writing and we let them have the lock)
// wait until they're done.
auto rc = futex(lockp, FUTEX_WAIT_BITSET, current, timeout, nullptr, writer_wake_mask);
auto rc = futex(lockp, FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG, current, timeout, nullptr, writer_wake_mask);
if (rc < 0 && errno == ETIMEDOUT && timeout) {
return value_if_timeout;
}
@ -794,7 +794,7 @@ int pthread_rwlock_unlock(pthread_rwlock_t* lockval_p)
auto desired = current & ~(writer_locked_mask | writer_intent_mask);
AK::atomic_store(lockp, desired, AK::MemoryOrder::memory_order_release);
// Then wake both readers and writers, if any.
auto rc = futex(lockp, FUTEX_WAKE_BITSET, current, nullptr, nullptr, (current & writer_wake_mask) | reader_wake_mask);
auto rc = futex(lockp, FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG, current, nullptr, nullptr, (current & writer_wake_mask) | reader_wake_mask);
if (rc < 0)
return errno;
return 0;