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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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9
libc/thread/pthread_cond_init.c
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@ -16,10 +16,11 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/sysv/consts/clock.h"
#include "libc/thread/thread.h"
/**
* Initializes condition.
* Initializes condition variable.
*
* @param attr may be null
* @return 0 on success, or error number on failure
@ -27,7 +28,9 @@
errno_t pthread_cond_init(pthread_cond_t *cond,
const pthread_condattr_t *attr) {
*cond = (pthread_cond_t){0};
if (attr)
cond->_pshared = *attr;
if (attr) {
cond->_pshared = attr->_pshared;
cond->_clock = attr->_clock;
}
return 0;
}