mirror of
git://git.musl-libc.org/musl
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4e98cce1c5
as a result of commit 12e1e32468, kernel
processing of the robust list is only needed for process-shared
mutexes. previously the first attempt to lock any owner-tracked mutex
resulted in robust list initialization and a set_robust_list syscall.
this is no longer necessary, and since the kernel's record of the
robust list must now be cleared at thread exit time for detached
threads, optimizing it out is more worthwhile than before too.
36 lines
646 B
C
36 lines
646 B
C
#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include "syscall.h"
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#include "libc.h"
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#include "pthread_impl.h"
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static void dummy(int x)
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{
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}
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weak_alias(dummy, __fork_handler);
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pid_t fork(void)
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{
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pid_t ret;
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sigset_t set;
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__fork_handler(-1);
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__block_all_sigs(&set);
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#ifdef SYS_fork
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ret = syscall(SYS_fork);
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#else
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ret = syscall(SYS_clone, SIGCHLD, 0);
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#endif
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if (libc.has_thread_pointer && !ret) {
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pthread_t self = __pthread_self();
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self->tid = __syscall(SYS_gettid);
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self->robust_list.off = 0;
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self->robust_list.pending = 0;
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libc.threads_minus_1 = 0;
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}
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__restore_sigs(&set);
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__fork_handler(!ret);
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return ret;
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}
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