[v8,08/10] eal: implement functions for thread barrier management
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Commit Message
From: Narcisa Vasile <navasile@microsoft.com>
Add functions for barrier init, destroy, wait.
A portable type is used to represent a barrier identifier.
The rte_thread_barrier_wait() function returns the same value
on all platforms.
---
lib/eal/common/rte_thread.c | 61 ++++++++++++++++++++++++++++++++++++
lib/eal/include/rte_thread.h | 58 ++++++++++++++++++++++++++++++++++
lib/eal/windows/rte_thread.c | 56 +++++++++++++++++++++++++++++++++
3 files changed, 175 insertions(+)
@@ -273,6 +273,67 @@ rte_thread_mutex_destroy(rte_thread_mutex_t *mutex)
return pthread_mutex_destroy(mutex);
}
+int
+rte_thread_barrier_init(rte_thread_barrier_t *barrier, int count)
+{
+ int ret = 0;
+ pthread_barrier_t *pthread_barrier = NULL;
+
+ RTE_VERIFY(barrier != NULL);
+ RTE_VERIFY(count > 0);
+
+ pthread_barrier = calloc(1, sizeof(*pthread_barrier));
+ if (pthread_barrier == NULL) {
+ RTE_LOG(DEBUG, EAL, "Unable to initialize barrier. Insufficient memory!\n");
+ ret = ENOMEM;
+ goto cleanup;
+ }
+ ret = pthread_barrier_init(pthread_barrier, NULL, count);
+ if (ret != 0) {
+ RTE_LOG(DEBUG, EAL, "Unable to initialize barrier, ret = %d\n", ret);
+ goto cleanup;
+ }
+
+ barrier->barrier_id = pthread_barrier;
+ pthread_barrier = NULL;
+
+cleanup:
+ free(pthread_barrier);
+ return ret;
+}
+
+int rte_thread_barrier_wait(rte_thread_barrier_t *barrier)
+{
+ int ret = 0;
+
+ RTE_VERIFY(barrier != NULL);
+ RTE_VERIFY(barrier->barrier_id != NULL);
+
+ ret = pthread_barrier_wait(barrier->barrier_id);
+ if (ret == PTHREAD_BARRIER_SERIAL_THREAD) {
+ ret = RTE_THREAD_BARRIER_SERIAL_THREAD;
+ }
+
+ return ret;
+}
+
+int rte_thread_barrier_destroy(rte_thread_barrier_t *barrier)
+{
+ int ret = 0;
+
+ RTE_VERIFY(barrier != NULL);
+
+ ret = pthread_barrier_destroy(barrier->barrier_id);
+ if (ret != 0) {
+ RTE_LOG(DEBUG, EAL, "Unable to destroy barrier, ret = %d\n", ret);
+ }
+
+ free(barrier->barrier_id);
+ barrier->barrier_id = NULL;
+
+ return ret;
+}
+
int rte_thread_cancel(rte_thread_t thread_id)
{
/*
@@ -29,6 +29,11 @@ extern "C" {
#include <rte_thread_types.h>
#endif
+/**
+ * Returned by rte_thread_barrier_wait() when call is successful.
+ */
+#define RTE_THREAD_BARRIER_SERIAL_THREAD -1
+
/**
* Thread id descriptor.
*/
@@ -56,6 +61,13 @@ typedef struct {
rte_cpuset_t cpuset; /**< thread affinity */
} rte_thread_attr_t;
+/**
+ * Thread barrier representation.
+ */
+typedef struct rte_thread_barrier_tag {
+ void* barrier_id; /**< barrrier identifier */
+} rte_thread_barrier_t;
+
/**
* TLS key type, an opaque pointer.
*/
@@ -300,6 +312,52 @@ int rte_thread_mutex_unlock(rte_thread_mutex_t *mutex);
__rte_experimental
int rte_thread_mutex_destroy(rte_thread_mutex_t *mutex);
+/**
+ * Initializes a synchronization barrier.
+ *
+ * @param barrier
+ * A pointer that references the newly created 'barrier' object.
+ *
+ * @param count
+ * The number of threads that must enter the barrier before
+ * the threads can continue execution.
+ *
+ * @return
+ * On success, return 0.
+ * On failure, return a positive errno-style error number.
+ */
+__rte_experimental
+int rte_thread_barrier_init(rte_thread_barrier_t *barrier, int count);
+
+/**
+ * Causes the calling thread to wait at the synchronization barrier 'barrier'.
+ *
+ * @param barrier
+ * The barrier used for synchronizing the threads.
+ *
+ * @return
+ * Return RTE_THREAD_BARRIER_SERIAL_THREAD for the thread synchronized
+ * at the barrier.
+ * Return 0 for all other threads.
+ * Return a positive errno-style error number, in case of failure.
+ */
+__rte_experimental
+int rte_thread_barrier_wait(rte_thread_barrier_t *barrier);
+
+/**
+ * Releases all resources used by a synchronization barrier
+ * and uninitializes it.
+ *
+ * @param barrier
+ * The barrier to be destroyed.
+ *
+ * @return
+ * On success, return 0.
+ * On failure, return a positive errno-style error number.
+ */
+__rte_experimental
+int rte_thread_barrier_destroy(rte_thread_barrier_t *barrier);
+
/**
* Terminates a thread.
*
@@ -552,6 +552,62 @@ rte_thread_mutex_destroy(rte_thread_mutex_t *mutex)
return 0;
}
+int
+rte_thread_barrier_init(rte_thread_barrier_t *barrier, int count)
+{
+ int ret = 0;
+ SYNCHRONIZATION_BARRIER *sync_barrier = NULL;
+
+ RTE_VERIFY(barrier != NULL);
+ RTE_VERIFY(count > 0);
+
+ sync_barrier = calloc(1, sizeof(*sync_barrier));
+ if (sync_barrier == NULL) {
+ RTE_LOG(DEBUG, EAL, "Unable to initialize barrier. Insufficient memory!\n");
+ ret = ENOMEM;
+ goto cleanup;
+ }
+ if (!InitializeSynchronizationBarrier(sync_barrier, count, -1)) {
+ ret = thread_log_last_error("InitializeSynchronizationBarrier()");
+ goto cleanup;
+ }
+
+ barrier->barrier_id = sync_barrier;
+ sync_barrier = NULL;
+
+cleanup:
+ free(sync_barrier);
+ return ret;
+}
+
+int
+rte_thread_barrier_wait(rte_thread_barrier_t *barrier)
+{
+ RTE_VERIFY(barrier != NULL);
+ RTE_VERIFY(barrier->barrier_id != NULL);
+
+ if (EnterSynchronizationBarrier(barrier->barrier_id,
+ SYNCHRONIZATION_BARRIER_FLAGS_BLOCK_ONLY)) {
+
+ return RTE_THREAD_BARRIER_SERIAL_THREAD;
+ }
+
+ return 0;
+}
+
+int
+rte_thread_barrier_destroy(rte_thread_barrier_t *barrier)
+{
+ RTE_VERIFY(barrier != NULL);
+
+ DeleteSynchronizationBarrier(barrier->barrier_id);
+
+ free(barrier->barrier_id);
+ barrier->barrier_id = NULL;
+
+ return 0;
+}
+
int
rte_thread_cancel(rte_thread_t thread_id)
{