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Introduce pthread_condattr_setclock()

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This is one of the few POSIX APIs that was missing. It lets you choose a
monotonic clock for your condition variables. This might improve perf on
some platforms. It might also grant more flexibility with NTP configs. I
know Qt is one project that believes it needs this. To introduce this, I
needed to change some the *NSYNC APIs, to support passing a clock param.
There's also new benchmarks, demonstrating Cosmopolitan's supremacy over
many libc implementations when it comes to mutex performance. Cygwin has
an alarmingly bad pthread_mutex_t implementation. It is so bad that they
would have been significantly better off if they'd used naive spinlocks.
This commit is contained in:
Justine Tunney 2024-09-02 23:37:50 -07:00
parent 79516bf08e
commit 3c61a541bd
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GPG key ID: BE714B4575D6E328
55 changed files with 449 additions and 155 deletions
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13
libc/thread/thread.h
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@ -56,7 +56,6 @@ COSMOPOLITAN_C_START_
typedef uintptr_t pthread_t;
typedef int pthread_id_np_t;
typedef char pthread_condattr_t;
typedef char pthread_rwlockattr_t;
typedef char pthread_barrierattr_t;
typedef unsigned pthread_key_t;
@ -83,12 +82,18 @@ typedef struct pthread_mutexattr_s {
unsigned _word;
} pthread_mutexattr_t;
typedef struct pthread_condattr_s {
char _pshared;
char _clock;
} pthread_condattr_t;
typedef struct pthread_cond_s {
union {
void *_align;
struct {
uint32_t _nsync;
char _pshared;
char _clock;
};
};
_PTHREAD_ATOMIC(uint32_t) _sequence;
@ -165,10 +170,12 @@ int pthread_cond_destroy(pthread_cond_t *) libcesque paramsnonnull();
int pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *) libcesque paramsnonnull((1));
int pthread_cond_signal(pthread_cond_t *) libcesque paramsnonnull();
int pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *) libcesque paramsnonnull();
int pthread_condattr_destroy(pthread_condattr_t *) libcesque paramsnonnull();
int pthread_condattr_getpshared(const pthread_condattr_t *, int *) libcesque paramsnonnull();
int pthread_condattr_init(pthread_condattr_t *) libcesque paramsnonnull();
int pthread_condattr_destroy(pthread_condattr_t *) libcesque paramsnonnull();
int pthread_condattr_setpshared(pthread_condattr_t *, int) libcesque paramsnonnull();
int pthread_condattr_getpshared(const pthread_condattr_t *, int *) libcesque paramsnonnull();
int pthread_condattr_setclock(pthread_condattr_t *, int) libcesque paramsnonnull();
int pthread_condattr_getclock(const pthread_condattr_t *, int *) libcesque paramsnonnull();
int pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *) dontthrow paramsnonnull((1));
int pthread_detach(pthread_t) libcesque;
int pthread_equal(pthread_t, pthread_t) libcesque;