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Introduce pthread_rwlock_try{rd,wr}lock

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This also changes recursive mutexes to favor cpu over scheduler yield.
This commit is contained in:
Justine Tunney 2023-10-31 21:59:05 -07:00
parent a1e1e821cb
commit fadb64a2bf
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GPG key ID: BE714B4575D6E328
13 changed files with 122 additions and 29 deletions
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21
test/libc/intrin/pthread_mutex_lock_test.c
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@ -43,6 +43,8 @@
#define THREADS 8
#define ITERATIONS 512
#define MAX_RECURSIVE_LOCKS 64
int count;
atomic_int started;
atomic_int finished;
@ -79,11 +81,18 @@ TEST(pthread_mutex_lock, recursive) {
ASSERT_EQ(0, pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE));
ASSERT_EQ(0, pthread_mutex_init(&lock, &attr));
ASSERT_EQ(0, pthread_mutexattr_destroy(&attr));
ASSERT_EQ(0, pthread_mutex_lock(&lock));
ASSERT_EQ(0, pthread_mutex_lock(&lock));
ASSERT_EQ(0, pthread_mutex_trylock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
for (int i = 0; i < MAX_RECURSIVE_LOCKS; ++i) {
if (i & 1) {
ASSERT_EQ(0, pthread_mutex_lock(&lock));
} else {
ASSERT_EQ(0, pthread_mutex_trylock(&lock));
}
}
ASSERT_EQ(EAGAIN, pthread_mutex_lock(&lock));
ASSERT_EQ(EAGAIN, pthread_mutex_trylock(&lock));
for (int i = 0; i < MAX_RECURSIVE_LOCKS; ++i) {
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
}
ASSERT_EQ(0, pthread_mutex_lock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
@ -99,7 +108,7 @@ TEST(pthread_mutex_lock, errorcheck) {
ASSERT_EQ(0, pthread_mutexattr_destroy(&attr));
ASSERT_EQ(0, pthread_mutex_lock(&lock));
ASSERT_EQ(EDEADLK, pthread_mutex_lock(&lock));
ASSERT_EQ(EBUSY, pthread_mutex_trylock(&lock));
ASSERT_EQ(EDEADLK, pthread_mutex_trylock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
ASSERT_EQ(0, pthread_mutex_destroy(&lock));
}