1 files changed, 94 insertions, 0 deletions
diff --git a/libparc/parc/algol/parc_AtomicInteger.c b/libparc/parc/algol/parc_AtomicInteger.c
new file mode 100755
index 00000000..b32a698f
--- /dev/null
+++ b/libparc/parc/algol/parc_AtomicInteger.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include <config.h>
+#include <pthread.h>
+
+#include <parc/algol/parc_AtomicInteger.h>
+
+#ifdef USE_GCC_EXTENSIONS
+uint32_t
+parcAtomicInteger_Uint32IncrementGCC(uint32_t *value)
+{
+    return __sync_add_and_fetch(value, 1);
+}
+
+uint32_t
+parcAtomicInteger_Uint32DecrementGCC(uint32_t *value)
+{
+    return __sync_sub_and_fetch(value, 1);
+}
+
+uint64_t
+parcAtomicInteger_Uint64IncrementGCC(uint64_t *value)
+{
+    return __sync_add_and_fetch(value, 1);
+}
+
+uint64_t
+parcAtomicInteger_Uint64DecrementGCC(uint64_t *value)
+{
+    return __sync_sub_and_fetch(value, 1);
+}
+#endif
+
+
+// Since there is no per integer mutex, we must use something to protect an integer from multiple,
+// simultaneous competitors.
+// Unfortunately, this is an indiscrimiate mutex causing all atomic integer updates to be
+// serialized rather than each individually protected.
+static pthread_mutex_t _parcAtomicInteger_PthreadMutex = PTHREAD_MUTEX_INITIALIZER;
+
+uint32_t
+parcAtomicInteger_Uint32IncrementPthread(uint32_t *value)
+{
+    pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
+    *value = *value + 1;
+    uint32_t result = *value;
+    pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
+    return result;
+}
+
+uint32_t
+parcAtomicInteger_Uint32DecrementPthread(uint32_t *value)
+{
+    pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
+    *value = *value - 1;
+    uint32_t result = *value;
+    pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
+    return result;
+}
+
+uint64_t
+parcAtomicInteger_Uint64IncrementPthread(uint64_t *value)
+{
+    pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
+    *value = *value + 1;
+    uint64_t result = *value;
+    pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
+    return result;
+}
+
+uint64_t
+parcAtomicInteger_Uint64DecrementPthread(uint64_t *value)
+{
+    pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
+    *value = *value - 1;
+    uint64_t result = *value;
+    pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
+    return result;
+}