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/*
* private.c
*
* Description:
* This translation unit implements routines which are private to
* the implementation and may be used throughout it.
*/
#include <errno.h>
#include "pthread.h"
#include "implement.h"
/*
* Code contributed by John E. Bossom <JEB>.
*/
int
_pthread_processInitialize (void)
/*
* ------------------------------------------------------
* DOCPRIVATE
* This function performs process wide initialization for
* the pthread library.
*
* PARAMETERS
* N/A
*
* DESCRIPTION
* This function performs process wide initialization for
* the pthread library.
* If successful, this routine sets the global variable
* _pthread_processInitialized to TRUE.
*
* RESULTS
* TRUE if successful,
* FALSE otherwise
*
* ------------------------------------------------------
*/
{
_pthread_processInitialized = TRUE;
/*
* Initialize Keys
*/
if ((pthread_key_create (&_pthread_selfThreadKey, NULL) != 0) ||
(pthread_key_create (&_pthread_cleanupKey, NULL) != 0))
{
_pthread_processTerminate ();
}
return (_pthread_processInitialized);
} /* processInitialize */
void
_pthread_processTerminate (void)
/*
* ------------------------------------------------------
* DOCPRIVATE
* This function performs process wide termination for
* the pthread library.
*
* PARAMETERS
* N/A
*
* DESCRIPTION
* This function performs process wide termination for
* the pthread library.
* This routine sets the global variable
* _pthread_processInitialized to FALSE
*
* RESULTS
* N/A
*
* ------------------------------------------------------
*/
{
if (_pthread_processInitialized)
{
if (_pthread_selfThreadKey != NULL)
{
/*
* Release _pthread_selfThreadKey
*/
pthread_key_delete (_pthread_selfThreadKey);
_pthread_selfThreadKey = NULL;
}
if (_pthread_cleanupKey != NULL)
{
/*
* Release _pthread_cleanupKey
*/
pthread_key_delete (_pthread_cleanupKey);
_pthread_cleanupKey = NULL;
}
_pthread_processInitialized = FALSE;
}
} /* processTerminate */
void *
_pthread_threadStart (ThreadParms * threadParms)
{
pthread_t tid;
void *(*start) (void *);
void *arg;
int status;
tid = threadParms->tid;
start = threadParms->start;
arg = threadParms->arg;
free (threadParms);
pthread_setspecific (_pthread_selfThreadKey, tid);
__try
{
/*
* Run the caller's routine;
*/
(*start) (arg);
status = 0;
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
/*
* A system unexpected exception had occurred running the user's
* routine. We get control back within this block.
*/
status = -1;
}
pthread_exit ((void *) status);
return ((void *) status);
} /* threadStart */
void
_pthread_threadDestroy (pthread_t thread)
{
if (thread != NULL)
{
_pthread_callUserDestroyRoutines (thread);
if (thread->cancelEvent != NULL)
{
CloseHandle (thread->cancelEvent);
}
free (thread);
}
} /* threadDestroy */
#if defined( KLUDGE )
void
_pthread_cleanupStack (void)
{
while (pthread_pop_cleanup (1))
{
}
} /* cleanupStack */
#endif /* KLUDGE */
int
_pthread_tkAssocCreate (ThreadKeyAssoc ** assocP,
pthread_t thread,
pthread_key_t key)
/*
* -------------------------------------------------------------------
* This routine creates an association that
* is unique for the given (thread,key) combination.The association
* is referenced by both the thread and the key.
* This association allows us to determine what keys the
* current thread references and what threads a given key
* references.
* See the detailed description
* at the beginning of this file for further details.
*
* Notes:
* 1) New associations are pushed to the beginning of the
* chain so that the internal _pthread_selfThreadKey association
* is always last, thus allowing selfThreadExit to
* be implicitly called by pthread_exit last.
*
* Parameters:
* assocP
* address into which the association is returned.
* thread
* current running thread. If NULL, then association
* is only added to the key. A NULL thread indicates
* that the user called pthread_setspecific prior
* to starting a thread. That's ok.
* key
* key on which to create an association.
* Returns:
* 0 - if successful,
* -1 - general error
* -------------------------------------------------------------------
*/
{
int result;
ThreadKeyAssoc *assoc;
/*
* Have to create an association and add it
* to both the key and the thread.
*/
assoc = (ThreadKeyAssoc *)
calloc (1, sizeof (*assoc));
if (assoc == NULL)
{
result = -1;
goto FAIL0;
}
if ((result = pthread_mutex_init (&(assoc->lock), NULL)) !=
0)
{
goto FAIL1;
}
assoc->thread = thread;
assoc->key = key;
/*
* Register assoc with key
*/
if ((result = pthread_mutex_lock (&(key->threadsLock))) !=
0)
{
goto FAIL2;
}
assoc->nextThread = (ThreadKeyAssoc *) key->threads;
key->threads = (void *) assoc;
pthread_mutex_unlock (&(key->threadsLock));
if (thread != NULL)
{
/*
* Register assoc with thread
*/
assoc->nextKey = (ThreadKeyAssoc *) thread->keys;
thread->keys = (void *) assoc;
}
*assocP = assoc;
return (result);
/*
* -------------
* Failure Code
* -------------
*/
FAIL2:
pthread_mutex_destroy (&(assoc->lock));
FAIL1:
free (assoc);
FAIL0:
return (result);
} /* tkAssocCreate */
void
_pthread_tkAssocDestroy (ThreadKeyAssoc * assoc)
/*
* -------------------------------------------------------------------
* This routine releases all resources for the given ThreadKeyAssoc
* once it is no longer being referenced
* ie) both the key and thread have stopped referencing it.
*
* Parameters:
* assoc
* an instance of ThreadKeyAssoc.
* Returns:
* N/A
* -------------------------------------------------------------------
*/
{
if ((assoc != NULL) &&
(assoc->key == NULL && assoc->thread == NULL))
{
pthread_mutex_destroy (&(assoc->lock));
free (assoc);
}
} /* tkAssocDestroy */
void
_pthread_callUserDestroyRoutines (pthread_t thread)
/*
* -------------------------------------------------------------------
* DOCPRIVATE
*
* This the routine runs through all thread keys and calls
* the destroy routines on the user's data for the current thread.
* It simulates the behaviour of POSIX Threads.
*
* PARAMETERS
* thread
* an instance of pthread_t
*
* RETURNS
* N/A
* -------------------------------------------------------------------
*/
{
ThreadKeyAssoc **nextP;
ThreadKeyAssoc *assoc;
if (thread != NULL)
{
/*
* Run through all Thread<-->Key associations
* for the current thread.
* If the pthread_key_t still exits (ie the assoc->key
* is not NULL) then call the user's TSD destroy routine.
* Notes:
* If assoc->key is NULL, then the user previously called
* PThreadKeyDestroy. The association is now only referenced
* by the current thread and must be released; otherwise
* the assoc will be destroyed when the key is destroyed.
*/
nextP = (ThreadKeyAssoc **) & (thread->keys);
assoc = *nextP;
while (assoc != NULL)
{
if (pthread_mutex_lock (&(assoc->lock)) == 0)
{
pthread_key_t k;
if ((k = assoc->key) != NULL)
{
/*
* Key still active; pthread_key_delete
* will block on this same mutex before
* it can release actual key; therefore,
* key is valid and we can call the destroy
* routine;
*/
void *value = NULL;
value = pthread_getspecific (k);
if (value != NULL && k->destructor != NULL)
{
__try
{
/*
* Run the caller's cleanup routine.
*/
(*(k->destructor)) (value);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
/*
* A system unexpected exception had occurred
* running the user's destructor.
* We get control back within this block.
*/
}
}
}
/*
* mark assoc->thread as NULL to indicate the
* thread no longer references this association
*/
assoc->thread = NULL;
/*
* Remove association from the pthread_t chain
*/
*nextP = assoc->nextKey;
pthread_mutex_unlock (&(assoc->lock));
_pthread_tkAssocDestroy (assoc);
assoc = *nextP;
}
}
}
} /* callUserDestroyRoutines */
/* </JEB> */

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