[d17546]: cleanup.c  Maximize  Restore  History

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/*
* cleanup.c
*
* Description:
* This translation unit implements routines associated cleaning up
* threads.
*/
#if !defined(_MSC_VER) && !defined(__cplusplus) && defined(__GNUC__)
#warning Compile __FILE__ as C++ or thread cancellation will not work properly.
#endif /* !_MSC_VER && !__cplusplus && __GNUC__ */
#include "pthread.h"
#include "implement.h"
/*
* Code contributed by John E. Bossom <JEB>.
*/
_pthread_cleanup_t *
pthread_pop_cleanup (int execute)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function pops the most recently pushed cleanup
* handler. If execute is nonzero, then the cleanup handler
* is executed if non-null.
*
* PARAMETERS
* execute
* if nonzero, execute the cleanup handler
*
*
* DESCRIPTION
* This function pops the most recently pushed cleanup
* handler. If execute is nonzero, then the cleanup handler
* is executed if non-null.
* NOTE: specify 'execute' as nonzero to avoid duplication
* of common cleanup code.
*
* RESULTS
* N/A
*
* ------------------------------------------------------
*/
{
_pthread_cleanup_t *cleanup;
cleanup = (_pthread_cleanup_t *) pthread_getspecific (_pthread_cleanupKey);
if (cleanup != NULL)
{
if (execute && (cleanup->routine != NULL))
{
#ifdef _MSC_VER
__try
{
/*
* Run the caller's cleanup routine.
*/
(*cleanup->routine) (cleanup->arg);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
/*
* A system unexpected exception had occurred
* running the user's cleanup routine.
* We get control back within this block.
*/
}
#else /* _MSC_VER */
#ifdef __cplusplus
try
{
/*
* Run the caller's cleanup routine.
*/
(*cleanup->routine) (cleanup->arg);
}
catch(...)
{
/*
* A system unexpected exception had occurred
* running the user's cleanup routine.
* We get control back within this block.
*/
}
#else /* __cplusplus */
/*
* Run the caller's cleanup routine and FIXME: hope for the best.
*/
(*cleanup->routine) (cleanup->arg);
#endif /* __cplusplus */
#endif /* _MSC_VER */
}
#if !defined(_MSC_VER) && !defined(__cplusplus)
pthread_setspecific (_pthread_cleanupKey, (void *) cleanup->prev);
#endif /* !_MSC_VER && !__cplusplus */
}
return (cleanup);
} /* _pthread_pop_cleanup */
void
pthread_push_cleanup (_pthread_cleanup_t * cleanup,
void (*routine) (void *),
void *arg)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function pushes a new cleanup handler onto the thread's stack
* of cleanup handlers. Each cleanup handler pushed onto the stack is
* popped and invoked with the argument 'arg' when
* a) the thread exits by calling 'pthread_exit',
* b) when the thread acts on a cancellation request,
* c) or when the thrad calls pthread_cleanup_pop with a nonzero
* 'execute' argument
*
* PARAMETERS
* cleanup
* a pointer to an instance of pthread_cleanup_t,
*
* routine
* pointer to a cleanup handler,
*
* arg
* parameter to be passed to the cleanup handler
*
*
* DESCRIPTION
* This function pushes a new cleanup handler onto the thread's stack
* of cleanup handlers. Each cleanup handler pushed onto the stack is
* popped and invoked with the argument 'arg' when
* a) the thread exits by calling 'pthread_exit',
* b) when the thread acts on a cancellation request,
* c) or when the thrad calls pthread_cleanup_pop with a nonzero
* 'execute' argument
* NOTE: pthread_push_cleanup, pthread_pop_cleanup must be paired
* in the same lexical scope.
*
* RESULTS
* pthread_cleanup_t *
* pointer to the previous cleanup
*
* ------------------------------------------------------
*/
{
cleanup->routine = routine;
cleanup->arg = arg;
#if !defined(_MSC_VER) && !defined(__cplusplus)
cleanup->prev = (_pthread_cleanup_t *) pthread_getspecific (_pthread_cleanupKey);
#endif /* !_MSC_VER && !__cplusplus */
pthread_setspecific (_pthread_cleanupKey, (void *) cleanup);
} /* _pthread_push_cleanup */
/* </JEB> */