mirror of
https://github.com/jart/cosmopolitan.git
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a359de7893
This changes *NSYNC to allocate waiters on the stack so our locks don't need to depend on dynamic memory. This make our runtiem simpler, and it also fixes bugs with thread cancellation support.
285 lines
8.6 KiB
C
285 lines
8.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/blocksigs.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.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/nexgen32e/nexgen32e.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.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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int pfds[2];
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pthread_cond_t cv;
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pthread_mutex_t mu;
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atomic_int gotcleanup;
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char testlib_enable_tmp_setup_teardown;
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void SetUp(void) {
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gotcleanup = false;
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}
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void OnCleanup(void *arg) {
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gotcleanup = true;
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}
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void *CancelSelfWorkerDeferred(void *arg) {
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char buf[8];
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pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, 0);
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pthread_cleanup_push(OnCleanup, 0);
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pthread_cancel(pthread_self());
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read(pfds[0], buf, sizeof(buf));
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pthread_cleanup_pop(0);
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return 0;
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}
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TEST(pthread_cancel, self_deferred_waitsForCancellationPoint) {
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void *rc;
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pthread_t th;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, CancelSelfWorkerDeferred, 0));
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_TRUE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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void *Worker(void *arg) {
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char buf[8];
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pthread_cleanup_push(OnCleanup, 0);
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read(pfds[0], buf, sizeof(buf));
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pthread_cleanup_pop(0);
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return 0;
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}
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TEST(pthread_cancel, synchronous) {
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void *rc;
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pthread_t th;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, Worker, 0));
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_TRUE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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TEST(pthread_cancel, synchronous_delayed) {
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void *rc;
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pthread_t th;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, Worker, 0));
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usleep(10);
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_TRUE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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void *DisabledWorker(void *arg) {
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char buf[8];
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pthread_setcancelstate(PTHREAD_CANCEL_MASKED, 0);
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pthread_cleanup_push(OnCleanup, 0);
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ASSERT_SYS(ECANCELED, -1, read(pfds[0], buf, sizeof(buf)));
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pthread_cleanup_pop(0);
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return 0;
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}
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TEST(pthread_cancel, masked) {
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void *rc;
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pthread_t th;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, DisabledWorker, 0));
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(0, rc);
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ASSERT_FALSE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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TEST(pthread_cancel, masked_delayed) {
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void *rc;
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pthread_t th;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, DisabledWorker, 0));
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usleep(10);
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(0, rc);
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ASSERT_FALSE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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void *CondWaitMaskedWorker(void *arg) {
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pthread_setcancelstate(PTHREAD_CANCEL_MASKED, 0);
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ASSERT_EQ(0, pthread_mutex_lock(&mu));
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ASSERT_EQ(ECANCELED, pthread_cond_timedwait(&cv, &mu, 0));
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ASSERT_EQ(0, pthread_mutex_unlock(&mu));
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return 0;
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}
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TEST(pthread_cancel, condMaskedWait) {
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void *rc;
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pthread_t th;
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ASSERT_EQ(0, pthread_create(&th, 0, CondWaitMaskedWorker, 0));
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(0, rc);
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}
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TEST(pthread_cancel, condWaitMaskedDelayed) {
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void *rc;
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pthread_t th;
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ASSERT_EQ(0, pthread_create(&th, 0, CondWaitMaskedWorker, 0));
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usleep(10);
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(0, rc);
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}
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void *CondWaitDeferredWorker(void *arg) {
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pthread_setcancelstate(PTHREAD_CANCEL_DEFERRED, 0);
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ASSERT_EQ(0, pthread_mutex_lock(&mu));
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ASSERT_EQ(ECANCELED, pthread_cond_timedwait(&cv, &mu, 0));
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__builtin_trap();
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}
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TEST(pthread_cancel, condDeferredWait_reacquiresMutex) {
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void *rc;
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pthread_t th;
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ASSERT_EQ(0, pthread_create(&th, 0, CondWaitDeferredWorker, 0));
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_EQ(EBUSY, pthread_mutex_trylock(&mu));
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ASSERT_EQ(0, pthread_mutex_unlock(&mu));
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}
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TEST(pthread_cancel, condDeferredWaitDelayed) {
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void *rc;
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pthread_t th;
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ASSERT_EQ(0, pthread_create(&th, 0, CondWaitDeferredWorker, 0));
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usleep(10);
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_EQ(EBUSY, pthread_mutex_trylock(&mu));
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ASSERT_EQ(0, pthread_mutex_unlock(&mu));
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}
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char *wouldleak;
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pthread_key_t key;
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bool key_destructor_was_run;
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atomic_int is_in_infinite_loop;
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void KeyDestructor(void *arg) {
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CheckStackIsAligned();
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ASSERT_EQ(31337, (intptr_t)arg);
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key_destructor_was_run = true;
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}
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#ifdef __x86_64__
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void TortureStack(void) {
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asm("sub\t$4,%rsp\n\t"
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"pause\n\t"
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"sub\t$2,%rsp\n\t"
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"pause\n\t"
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"add\t$6,%rsp");
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}
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#endif
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void *CpuBoundWorker(void *arg) {
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char *volatile wontleak1;
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char *volatile wontleak2;
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CheckStackIsAligned();
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wouldleak = malloc(123);
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wontleak1 = malloc(123);
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(void)wontleak1;
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pthread_cleanup_push(free, wontleak1);
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wontleak2 = _gc(malloc(123));
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(void)wontleak2;
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ASSERT_EQ(0, pthread_setspecific(key, (void *)31337));
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ASSERT_EQ(0, pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0));
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for (;;) {
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#ifdef __x86_64__
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TortureStack();
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#else
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CheckStackIsAligned();
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#endif
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is_in_infinite_loop = true;
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}
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pthread_cleanup_pop(1);
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free(wouldleak);
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return 0;
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}
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TEST(pthread_cancel, async) {
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void *rc;
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pthread_t th;
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ASSERT_EQ(0, pthread_key_create(&key, KeyDestructor));
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if (IsWindows()) {
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// asynchronous cancellations aren't possible on windows yet
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ASSERT_EQ(ENOTSUP, pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0));
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return;
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}
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wouldleak = NULL;
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is_in_infinite_loop = false;
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key_destructor_was_run = false;
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ASSERT_EQ(0, pthread_create(&th, 0, CpuBoundWorker, 0));
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while (!is_in_infinite_loop) pthread_yield();
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pthread_cancel(th);
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_TRUE(key_destructor_was_run);
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ASSERT_EQ(0, pthread_key_delete(key));
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free(wouldleak);
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}
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void *CancelSelfWorkerAsync(void *arg) {
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pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
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pthread_cleanup_push(OnCleanup, 0);
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pthread_cancel(pthread_self());
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pthread_cleanup_pop(0);
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return 0;
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}
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TEST(pthread_cancel, self_asynchronous_takesImmediateEffect) {
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void *rc;
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pthread_t th;
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if (IsWindows()) return;
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ASSERT_SYS(0, 0, pipe(pfds));
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ASSERT_EQ(0, pthread_create(&th, 0, CancelSelfWorkerAsync, 0));
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ASSERT_EQ(0, pthread_join(th, &rc));
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ASSERT_EQ(PTHREAD_CANCELED, rc);
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ASSERT_TRUE(gotcleanup);
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ASSERT_SYS(0, 0, close(pfds[1]));
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ASSERT_SYS(0, 0, close(pfds[0]));
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}
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