[Qemu-devel] [PATCH v3 01/10] Introduce qemu_cond_timedwait for POSIX

[Jan Kiszka]

First user will be POSIX compat aio. Windows use cases aren't in sight,
so this remains a POSIX-only service for now.

Signed-off-by: Jan Kiszka <address@hidden>
---
 qemu-thread-posix.c |   23 +++++++++++++++++++++++
 qemu-thread-posix.h |    5 +++++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/qemu-thread-posix.c b/qemu-thread-posix.c
index 9e1b5fb..cd65df2 100644
--- a/qemu-thread-posix.c
+++ b/qemu-thread-posix.c
@@ -17,6 +17,7 @@
 #include <signal.h>
 #include <stdint.h>
 #include <string.h>
+#include <sys/time.h>
 #include "qemu-thread.h"
 
 static void error_exit(int err, const char *msg)
@@ -115,6 +116,28 @@ void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
         error_exit(err, __func__);
 }
 
+/* Returns true if condition was signals, false if timed out. */
+bool qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex,
+                         unsigned int timeout_ms)
+{
+    struct timespec ts;
+    struct timeval tv;
+    int err;
+
+    gettimeofday(&tv, NULL);
+    ts.tv_sec = tv.tv_sec + timeout_ms / 1000;
+    ts.tv_nsec = tv.tv_usec * 1000 + timeout_ms % 1000;
+    if (ts.tv_nsec > 1000000000) {
+        ts.tv_sec++;
+        ts.tv_nsec -= 1000000000;
+    }
+    err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts);
+    if (err && err != ETIMEDOUT) {
+        error_exit(err, __func__);
+    }
+    return err == 0;
+}
+
 void qemu_thread_create(QemuThread *thread,
                        void *(*start_routine)(void*),
                        void *arg, int mode)
diff --git a/qemu-thread-posix.h b/qemu-thread-posix.h
index ee4618e..9f00524 100644
--- a/qemu-thread-posix.h
+++ b/qemu-thread-posix.h
@@ -1,5 +1,6 @@
 #ifndef __QEMU_THREAD_POSIX_H
 #define __QEMU_THREAD_POSIX_H 1
+#include <stdbool.h>
 #include "pthread.h"
 
 struct QemuMutex {
@@ -14,4 +15,8 @@ struct QemuThread {
     pthread_t thread;
 };
 
+/* only provided for posix so far */
+bool qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex,
+                         unsigned int timeout_ms);
+
 #endif
-- 
1.7.3.4