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new, shiny hack uses mutexes to determine the current pthread_descr without resorting to internal header files. muaha...

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Original commit message from CVS:
new, shiny hack uses mutexes to determine the current pthread_descr
without resorting to internal header files. muahaha ;)

this is only for linuxthreads, of course.
This commit is contained in:
Andy Wingo 2002-01-23 01:23:10 +00:00
parent 0fd25cc2c3
commit 5e48d598ea
1 changed files with 38 additions and 10 deletions
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48
gst/cothreads/test-pthreads.c
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@ -1,17 +1,15 @@
#define __USE_GNU /* non-posix functions */
#include <pthread.h>
#undef __USE_GNU
#include <stdio.h>
#include "linuxthreads-internals.h"
#pragma weak __pthread_initial_thread
extern pthread_descr __pthread_initial_thread;
static inline thread_self_descr()
{
// the thread_self algorithm:
/*
char * sp = CURRENT_STACK_FRAME;
int self = (int) pthread_self();
if (self % PTHREAD_THREADS_MAX < 2)
/* we only support the main thread, not the manager. */
* we only support the main thread, not the manager. *
return &__pthread_initial_thread;
#ifdef _STACK_GROWS_DOWN
@ -19,11 +17,41 @@ static inline thread_self_descr()
#else
return (pthread_descr)((unsigned long)sp &~ (STACK_SIZE-1));
#endif
*/
static _pthread_descr linuxthreads_self()
{
pthread_mutexattr_t mutexattr;
pthread_mutex_t mutex;
_pthread_descr self;
pthread_mutexattr_init (&mutexattr);
pthread_mutexattr_setkind_np (&mutexattr, PTHREAD_MUTEX_ERRORCHECK_NP);
pthread_mutex_init (&mutex, &mutexattr);
pthread_mutex_lock (&mutex);
self = mutex.__m_owner;
pthread_mutex_unlock (&mutex);
printf ("pthread_self: %d\n", pthread_self());
printf ("descr: %p\n", self);
return self;
}
void *pthread (void *unused)
{
linuxthreads_self();
return NULL;
}
int main (int argc, char *argv[])
{
printf ("pthread_self: %d\n", pthread_self());
printf ("descr: %p\n", thread_self_descr());
exit (0);
pthread_t tid;
pthread_create (&tid, NULL, pthread, NULL);
pthread_join (tid, NULL);
linuxthreads_self();
exit (0);
}