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sync.c    149 lines (129 with data), 3.7 kB

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/*
* sync.c
*
* Description:
* This translation unit implements functions related to thread
* synchronisation.
*/
#include "pthread.h"
#include "implement.h"
/*
* Code contributed by John E. Bossom <JEB>.
*/
int
pthread_detach (pthread_t tid)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function detaches the given thread.
*
* PARAMETERS
* thread
* an instance of a pthread_t
*
*
* DESCRIPTION
* This function detaches the given thread. You may
* detach the main thread or to detach a joinable thread
* (You should have used pthread_attr_t to create the
* thread as detached!)
* NOTE: detached threads cannot be joined nor canceled;
* storage is freed immediately on termination.
*
* RESULTS
* 0 successfully detached the thread,
* EINVAL thread is not a joinable thread,
* ENOSPC a required resource has been exhausted,
* ESRCH no thread could be found for 'thread',
*
* ------------------------------------------------------
*/
{
int result;
if (tid == NULL ||
tid->detachState == PTHREAD_CREATE_DETACHED)
{
result = EINVAL;
}
else
{
result = 0;
tid->detachState = PTHREAD_CREATE_DETACHED;
}
return (result);
} /* pthread_detach */
int
pthread_join (pthread_t thread, void **value_ptr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL. This also detaches the thread on successful
* completion.
*
* PARAMETERS
* thread
* an instance of pthread_t
*
* value_ptr
* pointer to an instance of pointer to void
*
*
* DESCRIPTION
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL. This also detaches the thread on successful
* completion.
* NOTE: detached threads cannot be joined or canceled
*
* RESULTS
* 0 'thread' has completed
* EINVAL thread is not a joinable thread,
* ESRCH no thread could be found with ID 'thread',
* EDEADLK attempt to join thread with self
*
* ------------------------------------------------------
*/
{
int result = 0;
pthread_t self;
self = pthread_self ();
if (pthread_equal (self, thread) == 0)
{
result = EDEADLK;
}
else if (thread->detachState == PTHREAD_CREATE_DETACHED)
{
result = EINVAL;
}
else
{
DWORD stat;
stat = WaitForSingleObject (thread->threadH, INFINITE);
if (stat == WAIT_OBJECT_0)
{
if (value_ptr != NULL
&& !GetExitCodeThread (thread->threadH, (LPDWORD) value_ptr))
{
result = ESRCH;
}
else
{
/*
* FIXME: This call frees memory used to hold the 'thread'
* object. 'thread' will be invalid after the first call.
*
* Only the last exiting join should free 'thread'.
*/
_pthread_threadDestroy (thread);
}
}
else
{
result = ESRCH;
}
}
return (result);
} /* pthread_join */
/* </JEB> */