[Qemu-devel] [PATCH V4 1/3] qemu: Add qemu-barrier support to qemu-thread framework.

[Gautham R Shenoy <ego@in.ibm.com>]

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
---
 qemu-thread.c |   23 +++++++++++++++++++++++
 qemu-thread.h |    9 +++++++++
 2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/qemu-thread.c b/qemu-thread.c
index 3923db7..7c445b6 100644
--- a/qemu-thread.c
+++ b/qemu-thread.c
@@ -161,3 +161,26 @@ int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2)
    return pthread_equal(thread1->thread, thread2->thread);
 }
 
+void qemu_barrier_init(QemuBarrier *barr1, int nr_threads)
+{
+    int err;
+
+    err = pthread_barrier_init(&barr1->barr, NULL, nr_threads);
+
+    if (err) {
+        error_exit(err, __func__);
+    }
+}
+
+int qemu_barrier_wait(QemuBarrier *barr1)
+{
+    int ret;
+
+    ret = pthread_barrier_wait(&barr1->barr);
+
+    if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD) {
+        error_exit(ret, __func__);
+    }
+
+    return ret;
+}
diff --git a/qemu-thread.h b/qemu-thread.h
index 5ef4a3a..b3d36e0 100644
--- a/qemu-thread.h
+++ b/qemu-thread.h
@@ -15,9 +15,14 @@ struct QemuThread {
     pthread_t thread;
 };
 
+struct QemuBarrier {
+    pthread_barrier_t barr;
+};
+
 typedef struct QemuMutex QemuMutex;
 typedef struct QemuCond QemuCond;
 typedef struct QemuThread QemuThread;
+typedef struct QemuBarrier QemuBarrier;
 
 void qemu_mutex_init(QemuMutex *mutex);
 void qemu_mutex_lock(QemuMutex *mutex);
@@ -31,10 +36,14 @@ void qemu_cond_broadcast(QemuCond *cond);
 void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
 int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs);
 
+void qemu_barrier_init(QemuBarrier *barr, int nr_threads);
+
 void qemu_thread_create(QemuThread *thread,
                        void *(*start_routine)(void*),
                        void *arg);
 void qemu_thread_signal(QemuThread *thread, int sig);
 void qemu_thread_self(QemuThread *thread);
 int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2);
+
+int qemu_barrier_wait(QemuBarrier *barr);
 #endif