[Qemu-devel] [PATCH v2 2/6] Introduce qemu_cond_timedwait for POSIX

[Jan Kiszka <jan.kiszka@web.de>]

On 2011-09-20 20:22, Paolo Bonzini wrote:
> On 09/20/2011 06:53 PM, Jan Kiszka wrote:
>> First user will be posix compat aio.
>>
>> Signed-off-by: Jan Kiszka<jan.kiszka@siemens.com>
> 
> I'm pretty sure the win32 version is not thread-safe,

Yeah, I would even say it's completely broken. Was a naive hack.

> but posix compat
> aio is currently POSIX only.  Just leave it out.
> 

-------8<-------

From: Jan Kiszka <jan.kiszka@siemens.com>

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 <jan.kiszka@siemens.com>
---
 qemu-thread-posix.c |   22 ++++++++++++++++++++++
 qemu-thread-posix.h |    2 ++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/qemu-thread-posix.c b/qemu-thread-posix.c
index f76427e..1d970fb 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 +116,27 @@ void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
         error_exit(err, __func__);
 }
 
+int 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 540fa0b..b4ae5ad 100644
--- a/qemu-thread-posix.h
+++ b/qemu-thread-posix.h
@@ -16,5 +16,7 @@ struct QemuThread {
 
 /* only provided for posix so far */
 void qemu_thread_join(QemuThread *thread);
+int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex,
+                        unsigned int timeout_ms);
 
 #endif