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When forking a process, only the running thread gets to live. All

Browse source 
other threads never see the light of day and if they leave things
locked, blame POSIX.
This commit is contained in:
John Birrell 1998-03-09 06:54:50 +00:00
parent e7b6782c39
commit 9dbdb44326
3 changed files with 117 additions and 0 deletions
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39
lib/libc_r/uthread/uthread_fork.c
View file

@ -42,7 +42,13 @@ pid_t
fork(void)
{
int flags;
int status;
pid_t ret;
pthread_t pthread;
pthread_t pthread_next;
/* Block signals to avoid being interrupted at a bad time: */
_thread_kern_sig_block(&status);
/* Fork a new process: */
if ((ret = _thread_sys_fork()) <= 0) {
@ -83,9 +89,42 @@ fork(void)
else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
/* Abort this application: */
abort();
} else {
/* Point to the first thread in the list: */
pthread = _thread_link_list;
/*
* Enter a loop to remove all threads other than
* the running thread from the thread list:
*/
while (pthread != NULL) {
pthread_next = pthread->nxt;
if (pthread == _thread_run) {
_thread_link_list = pthread;
pthread->nxt = NULL;
} else {
if (pthread->attr.stackaddr_attr ==
NULL && pthread->stack != NULL) {
/*
* Free the stack of the
* dead thread:
*/
free(pthread->stack);
}
if (pthread->specific_data != NULL)
free(pthread->specific_data);
free(pthread);
}
/* Point to the next thread: */
pthread = pthread_next;
}
}
}
/* Unblock signals: */
_thread_kern_sig_unblock(&status);
/* Return the process ID: */
return (ret);
}

39
lib/libkse/thread/thr_fork.c
View file

@ -42,7 +42,13 @@ pid_t
fork(void)
{
int flags;
int status;
pid_t ret;
pthread_t pthread;
pthread_t pthread_next;
/* Block signals to avoid being interrupted at a bad time: */
_thread_kern_sig_block(&status);
/* Fork a new process: */
if ((ret = _thread_sys_fork()) <= 0) {
@ -83,9 +89,42 @@ fork(void)
else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
/* Abort this application: */
abort();
} else {
/* Point to the first thread in the list: */
pthread = _thread_link_list;
/*
* Enter a loop to remove all threads other than
* the running thread from the thread list:
*/
while (pthread != NULL) {
pthread_next = pthread->nxt;
if (pthread == _thread_run) {
_thread_link_list = pthread;
pthread->nxt = NULL;
} else {
if (pthread->attr.stackaddr_attr ==
NULL && pthread->stack != NULL) {
/*
* Free the stack of the
* dead thread:
*/
free(pthread->stack);
}
if (pthread->specific_data != NULL)
free(pthread->specific_data);
free(pthread);
}
/* Point to the next thread: */
pthread = pthread_next;
}
}
}
/* Unblock signals: */
_thread_kern_sig_unblock(&status);
/* Return the process ID: */
return (ret);
}

39
lib/libpthread/thread/thr_fork.c
View file

@ -42,7 +42,13 @@ pid_t
fork(void)
{
int flags;
int status;
pid_t ret;
pthread_t pthread;
pthread_t pthread_next;
/* Block signals to avoid being interrupted at a bad time: */
_thread_kern_sig_block(&status);
/* Fork a new process: */
if ((ret = _thread_sys_fork()) <= 0) {
@ -83,9 +89,42 @@ fork(void)
else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
/* Abort this application: */
abort();
} else {
/* Point to the first thread in the list: */
pthread = _thread_link_list;
/*
* Enter a loop to remove all threads other than
* the running thread from the thread list:
*/
while (pthread != NULL) {
pthread_next = pthread->nxt;
if (pthread == _thread_run) {
_thread_link_list = pthread;
pthread->nxt = NULL;
} else {
if (pthread->attr.stackaddr_attr ==
NULL && pthread->stack != NULL) {
/*
* Free the stack of the
* dead thread:
*/
free(pthread->stack);
}
if (pthread->specific_data != NULL)
free(pthread->specific_data);
free(pthread);
}
/* Point to the next thread: */
pthread = pthread_next;
}
}
}
/* Unblock signals: */
_thread_kern_sig_unblock(&status);
/* Return the process ID: */
return (ret);
}