From: Narcisa Vasile <navas...@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.
Signed-off-by: Narcisa Vasile <navas...@microsoft.com>
---
lib/eal/common/rte_thread.c | 61 ++++++++++++++++++++++++++++++++++++
lib/eal/include/rte_thread.h | 58 ++++++++++++++++++++++++++++++++++
lib/eal/version.map | 3 ++
lib/eal/windows/rte_thread.c | 56 +++++++++++++++++++++++++++++++++
4 files changed, 178 insertions(+)
diff --git a/lib/eal/common/rte_thread.c b/lib/eal/common/rte_thread.c
index b3a9d4b47e..30e2ca79d1 100644
--- a/lib/eal/common/rte_thread.c
+++ b/lib/eal/common/rte_thread.c
@@ -295,6 +295,67 @@ rte_thread_detach(rte_thread_t thread_id)
return pthread_detach((pthread_t)thread_id.opaque_id);
}
+int
+rte_thread_barrier_init(rte_thread_barrier *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, "Failed to init 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 *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 *barrier)
+{
+ int ret = 0;
+
+ RTE_VERIFY(barrier != NULL);
+
+ ret = pthread_barrier_destroy(barrier->barrier_id);
+ if (ret != 0)
+ RTE_LOG(DEBUG, EAL, "Failed to destroy barrier: %d\n", ret);
+
+ free(barrier->barrier_id);
+ barrier->barrier_id = NULL;
+
+ return ret;
+}
+
int
rte_thread_key_create(rte_thread_key *key, void (*destructor)(void *))
{
diff --git a/lib/eal/include/rte_thread.h b/lib/eal/include/rte_thread.h
index e841321819..7c84e32988 100644
--- a/lib/eal/include/rte_thread.h
+++ b/lib/eal/include/rte_thread.h
@@ -54,6 +54,18 @@ typedef struct {
#endif /* RTE_HAS_CPUSET */
+/**
+ * Returned by rte_thread_barrier_wait() when call is successful.
+ */
+#define RTE_THREAD_BARRIER_SERIAL_THREAD -1
+
+/**
+ * Thread barrier representation.
+ */
+typedef struct rte_thread_barrier_tag {
+ void *barrier_id; /**< barrrier identifier */
+} rte_thread_barrier;
+
/**
* TLS key type, an opaque pointer.
*/
@@ -302,6 +314,52 @@ __rte_experimental
int rte_thread_set_priority(rte_thread_t thread_id,
enum rte_thread_priority priority);
+/**
+ * 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 *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 *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 *barrier);
+
/**
* Create a TLS data key visible to all threads in the process.
* the created key is later used to get/set a value.
diff --git a/lib/eal/version.map b/lib/eal/version.map
index 0384a09fa2..06e5f82da2 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -427,6 +427,9 @@ EXPERIMENTAL {
rte_thread_attr_get_affinity;
rte_thread_attr_set_affinity;
rte_thread_attr_set_priority;
+ rte_thread_barrier_init;
+ rte_thread_barrier_wait;
+ rte_thread_barrier_destroy;
rte_thread_get_affinity_by_id;
rte_thread_set_affinity_by_id;
rte_thread_get_priority;
diff --git a/lib/eal/windows/rte_thread.c b/lib/eal/windows/rte_thread.c
index 669a68d6a8..3f72bbf716 100644
--- a/lib/eal/windows/rte_thread.c
+++ b/lib/eal/windows/rte_thread.c
@@ -504,6 +504,62 @@ rte_thread_detach(rte_thread_t thread_id)
return 0;
}
+int
+rte_thread_barrier_init(rte_thread_barrier *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 *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 *barrier)
+{
+ RTE_VERIFY(barrier != NULL);
+
+ DeleteSynchronizationBarrier(barrier->barrier_id);
+
+ free(barrier->barrier_id);
+ barrier->barrier_id = NULL;
+
+ return 0;
+}
+
int
rte_thread_key_create(rte_thread_key *key,
__rte_unused void (*destructor)(void *))
--
2.31.0.vfs.0.1
