8cce15af83
if the process started with these signals blocked, cancellation could fail or setxid could deadlock. there is no way to globally unblock them after threads have been created. by unblocking them in the pthread_self initialization for the main thread, we ensure that they're unblocked before any other threads are created and also outside of any signal handler context (sigaction initialized pthread_self), which is important so that return from a signal handler won't re-block them.
36 lines
948 B
C
36 lines
948 B
C
#include "pthread_impl.h"
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static struct pthread main_thread;
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/* pthread_key_create.c overrides this */
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static const void *dummy[1] = { 0 };
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weak_alias(dummy, __pthread_tsd_main);
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static int init_main_thread()
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{
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__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
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if (__set_thread_area(&main_thread) < 0) return -1;
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main_thread.canceldisable = libc.canceldisable;
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main_thread.tsd = (void **)__pthread_tsd_main;
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main_thread.errno_ptr = __errno_location();
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main_thread.self = &main_thread;
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main_thread.tid = main_thread.pid =
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__syscall(SYS_set_tid_address, &main_thread.tid);
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libc.main_thread = &main_thread;
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return 0;
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}
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pthread_t __pthread_self_def()
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{
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static int init, failed;
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if (!init) {
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if (failed) return 0;
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if (init_main_thread() < 0) failed = 1;
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if (failed) return 0;
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init = 1;
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}
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return __pthread_self();
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}
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weak_alias(__pthread_self_def, pthread_self);
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weak_alias(__pthread_self_def, __pthread_self_init);
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