mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-05-24 06:12:27 +00:00
Implement pthread_atfork()
If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
This commit is contained in:
Justine Tunney
parent
64c284003d
commit
60cb435cb4
124 changed files with 2169 additions and 718 deletions
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@ -18,12 +18,15 @@
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╚─────────────────────────────────────────────────────────────────────────────*/
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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/runtime/runtime.h"
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#include "libc/stdio/temp.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/testlib/subprocess.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/semaphore.h"
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#include "libc/thread/thread.h"
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@ -31,50 +34,158 @@
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pthread_barrier_t barrier;
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char testlib_enable_tmp_setup_teardown;
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void SetUp(void) {
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// TODO(jart): Fix shocking GitHub Actions error.
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if (getenv("CI")) exit(0);
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sem_unlink("/fooz");
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sem_unlink("/barz");
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}
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void IgnoreStderr(void) {
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close(2);
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open("/dev/null", O_WRONLY);
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}
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void *Worker(void *arg) {
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sem_t *a, *b;
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struct timespec ts;
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ASSERT_NE(SEM_FAILED, (a = sem_open("fooz", O_CREAT, 0644)));
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ASSERT_NE(SEM_FAILED, (b = sem_open("barz", O_CREAT, 0644)));
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ASSERT_NE(SEM_FAILED, (a = sem_open("/fooz", 0)));
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ASSERT_EQ((sem_t *)arg, a);
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ASSERT_NE(SEM_FAILED, (b = sem_open("/barz", 0)));
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if (pthread_barrier_wait(&barrier) == PTHREAD_BARRIER_SERIAL_THREAD) {
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if (!IsWindows()) { // :'(
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ASSERT_SYS(0, 0, sem_unlink("fooz"));
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ASSERT_SYS(0, 0, sem_unlink("barz"));
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}
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ASSERT_SYS(0, 0, sem_unlink("/fooz"));
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}
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ASSERT_SYS(0, 0, clock_gettime(CLOCK_REALTIME, &ts));
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ts.tv_sec += 1;
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ASSERT_SYS(0, 0, sem_post(a));
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ASSERT_SYS(0, 0, sem_timedwait(b, &ts));
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ASSERT_SYS(0, 0, sem_close(b));
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ASSERT_TRUE(testlib_memoryexists(b));
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ASSERT_SYS(0, 0, sem_close(a));
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ASSERT_TRUE(testlib_memoryexists(a));
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return 0;
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}
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// 1. multiple threads opening same name must yield same address
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// 2. semaphore memory is freed, when all threads have closed it
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// 3. semaphore may be unlinked before it's closed, from creator
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// 4. semaphore may be unlinked before it's closed, from threads
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TEST(sem_open, test) {
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if (IsLinux()) return; // TODO(jart): Fix shocking GitHub Actions error.
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sem_t *a, *b;
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int i, r, n = 4;
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pthread_t *t = _gc(malloc(sizeof(pthread_t) * n));
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sem_unlink("barz");
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sem_unlink("fooz");
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sem_unlink("/fooz");
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sem_unlink("/barz");
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errno = 0;
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ASSERT_EQ(0, pthread_barrier_init(&barrier, 0, n));
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ASSERT_NE(SEM_FAILED, (a = sem_open("fooz", O_CREAT, 0644)));
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ASSERT_NE(SEM_FAILED, (b = sem_open("barz", O_CREAT, 0644)));
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ASSERT_NE(SEM_FAILED, (a = sem_open("/fooz", O_CREAT, 0644, 0)));
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ASSERT_NE(SEM_FAILED, (b = sem_open("/barz", O_CREAT, 0644, 0)));
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ASSERT_SYS(0, 0, sem_getvalue(a, &r));
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ASSERT_EQ(0, r);
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ASSERT_SYS(0, 0, sem_getvalue(b, &r));
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ASSERT_EQ(0, r);
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for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_create(t + i, 0, Worker, 0));
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for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_create(t + i, 0, Worker, a));
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for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_wait(a));
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ASSERT_SYS(0, 0, sem_getvalue(a, &r));
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ASSERT_EQ(0, r);
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for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_post(b));
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for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_join(t[i], 0));
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ASSERT_SYS(0, 0, sem_unlink("/barz"));
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ASSERT_SYS(0, 0, sem_getvalue(b, &r));
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ASSERT_EQ(0, r);
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ASSERT_SYS(0, 0, sem_close(b));
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ASSERT_FALSE(testlib_memoryexists(b));
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ASSERT_SYS(0, 0, sem_close(a));
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ASSERT_FALSE(testlib_memoryexists(a));
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ASSERT_EQ(0, pthread_barrier_destroy(&barrier));
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}
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TEST(sem_close, withUnnamedSemaphore_isUndefinedBehavior) {
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if (!IsModeDbg()) return;
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sem_t sem;
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ASSERT_SYS(0, 0, sem_init(&sem, 1, 0));
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SPAWN(fork);
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IgnoreStderr();
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sem_close(&sem);
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EXITS(77);
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ASSERT_SYS(0, 0, sem_destroy(&sem));
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}
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TEST(sem_destroy, withNamedSemaphore_isUndefinedBehavior) {
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if (!IsModeDbg()) return;
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sem_t *sem;
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ASSERT_NE(SEM_FAILED, (sem = sem_open("/boop", O_CREAT, 0644, 0)));
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SPAWN(fork);
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IgnoreStderr();
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sem_destroy(sem);
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EXITS(77);
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ASSERT_SYS(0, 0, sem_unlink("/boop"));
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ASSERT_SYS(0, 0, sem_close(sem));
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}
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TEST(sem_open, inheritAcrossFork) {
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sem_t *a, *b;
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struct timespec ts;
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ASSERT_SYS(0, 0, clock_gettime(CLOCK_REALTIME, &ts));
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ts.tv_sec += 1;
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errno = 0;
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ASSERT_NE(SEM_FAILED, (a = sem_open("/fooz", O_CREAT, 0644, 0)));
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ASSERT_SYS(0, 0, sem_unlink("/fooz"));
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ASSERT_NE(SEM_FAILED, (b = sem_open("/barz", O_CREAT, 0644, 0)));
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ASSERT_SYS(0, 0, sem_unlink("/barz"));
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SPAWN(fork);
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ASSERT_SYS(0, 0, sem_post(a));
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ASSERT_SYS(0, 0, sem_wait(b));
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PARENT();
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ASSERT_SYS(0, 0, sem_wait(a));
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ASSERT_SYS(0, 0, sem_post(b));
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WAIT(exit, 0);
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ASSERT_SYS(0, 0, sem_close(b));
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ASSERT_FALSE(testlib_memoryexists(b));
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ASSERT_SYS(0, 0, sem_close(a));
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ASSERT_FALSE(testlib_memoryexists(a));
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}
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TEST(sem_open, openReadonlyAfterUnlink_enoent) {
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sem_t *sem;
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sem_unlink("/fooz");
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ASSERT_NE(SEM_FAILED, (sem = sem_open("/fooz", O_CREAT, 0644, 0)));
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ASSERT_EQ(0, sem_unlink("/fooz"));
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ASSERT_EQ(SEM_FAILED, sem_open("/fooz", O_RDONLY));
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ASSERT_EQ(ENOENT, errno);
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ASSERT_EQ(0, sem_close(sem));
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}
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TEST(sem_open, openReadonlyAfterIndependentUnlinkAndRecreate_returnsNewOne) {
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if (1) return;
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sem_t *a, *b;
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ASSERT_NE(SEM_FAILED, (a = sem_open("/fooz", O_CREAT, 0644, 0)));
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SPAWN(fork);
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ASSERT_EQ(0, sem_unlink("/fooz"));
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ASSERT_NE(SEM_FAILED, (b = sem_open("/fooz", O_CREAT, 0644, 0)));
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ASSERT_NE(a, b);
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ASSERT_SYS(0, 0, sem_post(a));
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ASSERT_SYS(0, 0, sem_wait(b));
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ASSERT_EQ(0, sem_close(b));
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PARENT();
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ASSERT_SYS(0, 0, sem_wait(a));
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ASSERT_NE(SEM_FAILED, (b = sem_open("/fooz", O_RDONLY)));
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ASSERT_NE(a, b);
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ASSERT_SYS(0, 0, sem_post(b));
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ASSERT_EQ(0, sem_close(b));
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WAIT(exit, 0);
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ASSERT_EQ(0, sem_close(a));
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}
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TEST(sem_close, openTwiceCloseOnce_stillMapped) {
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if (1) return;
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sem_t *a, *b;
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char name[] = "smXXXXXX";
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ASSERT_NE(NULL, mktemp(name));
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ASSERT_NE(SEM_FAILED, (a = sem_open(name, O_CREAT | O_EXCL, 0600, 0)));
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ASSERT_NE(SEM_FAILED, (b = sem_open(name, 0)));
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ASSERT_SYS(0, 0, sem_unlink(name));
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ASSERT_SYS(0, 0, sem_close(a));
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ASSERT_SYS(0, 0, sem_post(a));
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ASSERT_SYS(0, 0, sem_close(b));
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}
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