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authorrpj <rpj>2002-02-18 03:16:52 +0000
committerrpj <rpj>2002-02-18 03:16:52 +0000
commita416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 (patch)
tree72f776cd64e48824a5578ff7a523bc69097143b4 /pthread_cond_init.c
parente6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (diff)
Major reorganisation of source code; new routine and tests added.
Diffstat (limited to 'pthread_cond_init.c')
-rw-r--r--pthread_cond_init.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/pthread_cond_init.c b/pthread_cond_init.c
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+/*
+ * pthread_cond_init.c
+ *
+ * Description:
+ * This translation unit implements condition variables and their primitives.
+ *
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2002 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@ise.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"
+
+
+int
+pthread_cond_init (pthread_cond_t * cond, const pthread_condattr_t * attr)
+ /*
+ * ------------------------------------------------------
+ * DOCPUBLIC
+ * This function initializes a condition variable.
+ *
+ * PARAMETERS
+ * cond
+ * pointer to an instance of pthread_cond_t
+ *
+ * attr
+ * specifies optional creation attributes.
+ *
+ *
+ * DESCRIPTION
+ * This function initializes a condition variable.
+ *
+ * RESULTS
+ * 0 successfully created condition variable,
+ * EINVAL 'attr' is invalid,
+ * EAGAIN insufficient resources (other than
+ * memory,
+ * ENOMEM insufficient memory,
+ * EBUSY 'cond' is already initialized,
+ *
+ * ------------------------------------------------------
+ */
+{
+ int result;
+ pthread_cond_t cv = NULL;
+
+ if (cond == NULL)
+ {
+ return EINVAL;
+ }
+
+ if ((attr != NULL && *attr != NULL) &&
+ ((*attr)->pshared == PTHREAD_PROCESS_SHARED))
+ {
+ /*
+ * Creating condition variable that can be shared between
+ * processes.
+ */
+ result = ENOSYS;
+ goto DONE;
+ }
+
+ cv = (pthread_cond_t) calloc(1, sizeof (*cv));
+
+ if (cv == NULL)
+ {
+ result = ENOMEM;
+ goto DONE;
+ }
+
+ cv->nWaitersBlocked = 0;
+ cv->nWaitersToUnblock = 0;
+ cv->nWaitersGone = 0;
+
+ if (sem_init(&(cv->semBlockLock), 0, 1) != 0)
+ {
+ result = errno;
+ goto FAIL0;
+ }
+
+ if (sem_init(&(cv->semBlockQueue), 0, 0) != 0)
+ {
+ result = errno;
+ goto FAIL1;
+ }
+
+ if ((result = pthread_mutex_init(&(cv->mtxUnblockLock), 0)) != 0)
+ {
+ goto FAIL2;
+ }
+
+ result = 0;
+
+ goto DONE;
+
+ /*
+ * -------------
+ * Failed...
+ * -------------
+ */
+FAIL2:
+ (void) sem_destroy(&(cv->semBlockQueue));
+
+FAIL1:
+ (void) sem_destroy(&(cv->semBlockLock));
+
+FAIL0:
+ (void) free(cv);
+ cv = NULL;
+
+DONE:
+ if (0 == result)
+ {
+ EnterCriticalSection(&ptw32_cond_list_lock);
+
+ cv->next = NULL;
+ cv->prev = ptw32_cond_list_tail;
+
+ if (ptw32_cond_list_tail != NULL)
+ {
+ ptw32_cond_list_tail->next = cv;
+ }
+
+ ptw32_cond_list_tail = cv;
+
+ if (ptw32_cond_list_head == NULL)
+ {
+ ptw32_cond_list_head = cv;
+ }
+
+ LeaveCriticalSection(&ptw32_cond_list_lock);
+ }
+ *cond = cv;
+
+ return result;
+
+} /* pthread_cond_init */