mirror of
https://github.com/jart/cosmopolitan.git
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3c61a541bd
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.
64 lines
3.6 KiB
C
64 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/errno.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/thread2.h"
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TEST(pthread_cond_timedwait, real) {
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pthread_cond_t cv;
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pthread_mutex_t mu;
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pthread_condattr_t ca;
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ASSERT_EQ(0, pthread_condattr_init(&ca));
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ASSERT_EQ(0, pthread_condattr_setclock(&ca, CLOCK_REALTIME));
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ASSERT_EQ(0, pthread_cond_init(&cv, &ca));
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ASSERT_EQ(0, pthread_condattr_destroy(&ca));
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ASSERT_EQ(0, pthread_mutex_init(&mu, 0));
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ASSERT_EQ(0, pthread_mutex_lock(&mu));
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struct timespec start = timespec_real();
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struct timespec deadline = timespec_add(start, timespec_frommillis(100));
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ASSERT_EQ(ETIMEDOUT, pthread_cond_timedwait(&cv, &mu, &deadline));
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struct timespec end = timespec_real();
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ASSERT_GE(timespec_tomillis(timespec_sub(end, start)), 100);
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ASSERT_EQ(0, pthread_mutex_unlock(&mu));
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ASSERT_EQ(0, pthread_mutex_destroy(&mu));
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ASSERT_EQ(0, pthread_cond_destroy(&cv));
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}
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TEST(pthread_cond_timedwait, mono) {
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pthread_cond_t cv;
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pthread_mutex_t mu;
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pthread_condattr_t ca;
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ASSERT_EQ(0, pthread_condattr_init(&ca));
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ASSERT_EQ(0, pthread_condattr_setclock(&ca, CLOCK_MONOTONIC));
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ASSERT_EQ(0, pthread_cond_init(&cv, &ca));
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ASSERT_EQ(0, pthread_condattr_destroy(&ca));
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ASSERT_EQ(0, pthread_mutex_init(&mu, 0));
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ASSERT_EQ(0, pthread_mutex_lock(&mu));
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struct timespec start = timespec_mono();
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struct timespec deadline = timespec_add(start, timespec_frommillis(100));
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ASSERT_EQ(ETIMEDOUT, pthread_cond_timedwait(&cv, &mu, &deadline));
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struct timespec end = timespec_mono();
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ASSERT_GE(timespec_tomillis(timespec_sub(end, start)), 100);
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ASSERT_EQ(0, pthread_mutex_unlock(&mu));
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ASSERT_EQ(0, pthread_mutex_destroy(&mu));
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ASSERT_EQ(0, pthread_cond_destroy(&cv));
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}
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