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Improve multithreading

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Justine Tunney 2024-07-21 06:41:30 -07:00
parent d3167126aa
commit 30afd6ddbb
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GPG key ID: BE714B4575D6E328
38 changed files with 752 additions and 174 deletions
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27
libc/thread/pthread_exit.c
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@ -69,23 +69,33 @@
* @noreturn
*/
wontreturn void pthread_exit(void *rc) {
int orphan;
struct CosmoTib *tib;
struct PosixThread *pt;
enum PosixThreadStatus status, transition;
STRACE("pthread_exit(%p)", rc);
// get posix thread object
tib = __get_tls();
pt = (struct PosixThread *)tib->tib_pthread;
pt->pt_flags |= PT_NOCANCEL;
pt->pt_rc = rc;
STRACE("pthread_exit(%p)", rc);
// "The behavior of pthread_exit() is undefined if called from a
// cancellation cleanup handler or destructor function that was
// invoked as a result of either an implicit or explicit call to
// pthread_exit()." ──Quoth POSIX.1-2017
unassert(!(pt->pt_flags & PT_EXITING));
// set state
pt->pt_flags |= PT_NOCANCEL | PT_EXITING;
pt->pt_rc = rc;
// free resources
__cxa_thread_finalize();
_pthread_decimate();
// run atexit handlers if orphaned thread
if (pthread_orphan_np())
_pthread_decimate(true);
if ((orphan = pthread_orphan_np()))
if (_weaken(__cxa_finalize))
_weaken(__cxa_finalize)(NULL);
@ -113,8 +123,11 @@ wontreturn void pthread_exit(void *rc) {
if (transition == kPosixThreadZombie)
_pthread_zombify(pt);
// check if this is the last survivor
if (pthread_orphan_np()) {
// "The process shall exit with an exit status of 0 after the last
// thread has been terminated. The behavior shall be as if the
// implementation called exit() with a zero argument at thread
// termination time." ──Quoth POSIX.1-2017
if (orphan) {
for (const uintptr_t *p = __fini_array_end; p > __fini_array_start;)
((void (*)(void))(*--p))();
_Exit(0);