mirror of
https://github.com/jart/cosmopolitan.git
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2d43d400c6
Cosmo now has a non-nsync implementation of POSIX read-write locks. It's possible to call pthread_rwlockattr_setpshared in PTHREAD_PROCESS_SHARED mode. Furthermore, if cosmo is built with PTHREAD_USE_NSYNC set to zero, then Cosmo shouldn't use nsync at all. That's helpful if you want to not link any Apache 2.0 licensed code.
95 lines
3.9 KiB
C
95 lines
3.9 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 2022 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/atomic.h"
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#include "libc/calls/calls.h"
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#include "libc/mem/gc.h"
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#include "libc/mem/mem.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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#define READERS 8
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#define WRITERS 2
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#define READER_ITERATIONS 10000
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#define WRITER_ITERATIONS 1000
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int writes;
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atomic_int reads;
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pthread_rwlock_t lock;
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pthread_rwlockattr_t attr;
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pthread_barrier_t barrier;
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FIXTURE(pthread_rwlock, private) {
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reads = 0;
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writes = 0;
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ASSERT_EQ(0, pthread_rwlockattr_init(&attr));
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ASSERT_EQ(0, pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE));
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ASSERT_EQ(0, pthread_rwlock_init(&lock, &attr));
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ASSERT_EQ(0, pthread_rwlockattr_destroy(&attr));
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}
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FIXTURE(pthread_rwlock, pshared) {
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reads = 0;
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writes = 0;
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ASSERT_EQ(0, pthread_rwlockattr_init(&attr));
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ASSERT_EQ(0, pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
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ASSERT_EQ(0, pthread_rwlock_init(&lock, &attr));
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ASSERT_EQ(0, pthread_rwlockattr_destroy(&attr));
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}
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void TearDown(void) {
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ASSERT_EQ(0, pthread_rwlock_destroy(&lock));
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}
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void *Reader(void *arg) {
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pthread_barrier_wait(&barrier);
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for (int i = 0; i < READER_ITERATIONS; ++i) {
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ASSERT_EQ(0, pthread_rwlock_rdlock(&lock));
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++reads;
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ASSERT_EQ(0, pthread_rwlock_unlock(&lock));
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}
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return 0;
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}
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void *Writer(void *arg) {
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pthread_barrier_wait(&barrier);
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for (int i = 0; i < WRITER_ITERATIONS; ++i) {
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ASSERT_EQ(0, pthread_rwlock_wrlock(&lock));
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++writes;
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ASSERT_EQ(0, pthread_rwlock_unlock(&lock));
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for (volatile int i = 0; i < 100; ++i)
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pthread_pause_np();
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}
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return 0;
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}
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TEST(pthread_rwlock_rdlock, test) {
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int i;
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pthread_t *t = gc(malloc(sizeof(pthread_t) * (READERS + WRITERS)));
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ASSERT_EQ(0, pthread_barrier_init(&barrier, 0, READERS + WRITERS));
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for (i = 0; i < READERS + WRITERS; ++i) {
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ASSERT_SYS(0, 0,
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pthread_create(t + i, 0, i < READERS ? Reader : Writer, 0));
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}
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for (i = 0; i < READERS + WRITERS; ++i) {
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EXPECT_SYS(0, 0, pthread_join(t[i], 0));
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}
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EXPECT_EQ(READERS * READER_ITERATIONS, reads);
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EXPECT_EQ(WRITERS * WRITER_ITERATIONS, writes);
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ASSERT_EQ(0, pthread_barrier_destroy(&barrier));
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}
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