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Diffstat (limited to 'pthreads/src/cleanup.c')
| -rw-r--r-- | pthreads/src/cleanup.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/pthreads/src/cleanup.c b/pthreads/src/cleanup.c new file mode 100644 index 0000000..381d1e8 --- /dev/null +++ b/pthreads/src/cleanup.c @@ -0,0 +1,148 @@ +/* + * cleanup.c + * + * Description: + * This translation unit implements routines associated + * with cleaning up threads. + * + * + * -------------------------------------------------------------------------- + * + * Pthreads-win32 - POSIX Threads Library for Win32 + * Copyright(C) 1998 John E. Bossom + * Copyright(C) 1999,2005 Pthreads-win32 contributors + * + * Contact Email: rpj@callisto.canberra.edu.au + * + * The current list of contributors is contained + * in the file CONTRIBUTORS included with the source + * code distribution. The list can also be seen at the + * following World Wide Web location: + * http://sources.redhat.com/pthreads-win32/contributors.html + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library in the file COPYING.LIB; + * if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +#include "pthread.h" +#include "implement.h" + + +/* + * The functions ptw32_pop_cleanup and ptw32_push_cleanup + * are implemented here for applications written in C with no + * SEH or C++ destructor support. + */ + +ptw32_cleanup_t * +ptw32_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 + * + * ------------------------------------------------------ + */ +{ + ptw32_cleanup_t *cleanup; + + cleanup = (ptw32_cleanup_t *) pthread_getspecific (ptw32_cleanupKey); + + if (cleanup != NULL) + { + if (execute && (cleanup->routine != NULL)) + { + + (*cleanup->routine) (cleanup->arg); + + } + + pthread_setspecific (ptw32_cleanupKey, (void *) cleanup->prev); + + } + + return (cleanup); + +} /* ptw32_pop_cleanup */ + + +void +ptw32_push_cleanup (ptw32_cleanup_t * cleanup, + ptw32_cleanup_callback_t routine, 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 thread 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, ptw32_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; + + cleanup->prev = (ptw32_cleanup_t *) pthread_getspecific (ptw32_cleanupKey); + + pthread_setspecific (ptw32_cleanupKey, (void *) cleanup); + +} /* ptw32_push_cleanup */ |