Rich Felker
870cc67977
some functions that should have been testing whether pthread_self() had been called and initialized the thread pointer were instead testing whether pthread_create() had been called and actually made the program "threaded". while it's unlikely any mismatch would occur in real-world problems, this could have introduced subtle bugs. now, we store the address of the main thread's thread descriptor in the libc structure and use its presence as a flag that the thread register is initialized. note that after fork, the calling thread (not necessarily the original main thread) is the new main thread.
20 lines
429 B
C
20 lines
429 B
C
#include <unistd.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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pid_t fork(void)
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{
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pid_t ret;
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if (libc.fork_handler) libc.fork_handler(-1);
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ret = syscall(SYS_fork);
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if (libc.main_thread && !ret) {
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pthread_t self = __pthread_self();
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self->tid = self->pid = syscall(SYS_getpid);
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libc.threads_minus_1 = 0;
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libc.main_thread = self;
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}
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if (libc.fork_handler) libc.fork_handler(!ret);
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return ret;
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}
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