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[PATCH 1/4] Add a mutex to guarantee single writer to qemu_logfile handl
From: |
Robert Foley |
Subject: |
[PATCH 1/4] Add a mutex to guarantee single writer to qemu_logfile handle. |
Date: |
Thu, 7 Nov 2019 09:26:10 -0500 |
This is being added in preparation for using RCU with the logfile handle.
Also added qemu_logfile_init() for initializing the logfile mutex.
Signed-off-by: Robert Foley <address@hidden>
---
util/log.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/util/log.c b/util/log.c
index 1ca13059ee..dff2f98c8c 100644
--- a/util/log.c
+++ b/util/log.c
@@ -24,8 +24,11 @@
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "trace/control.h"
+#include "qemu/thread.h"
static char *logfilename;
+static bool qemu_logfile_initialized;
+static QemuMutex qemu_logfile_mutex;
FILE *qemu_logfile;
int qemu_loglevel;
static int log_append = 0;
@@ -49,6 +52,14 @@ int qemu_log(const char *fmt, ...)
return ret;
}
+static void qemu_logfile_init(void)
+{
+ if (!qemu_logfile_initialized) {
+ qemu_mutex_init(&qemu_logfile_mutex);
+ qemu_logfile_initialized = true;
+ }
+}
+
static bool log_uses_own_buffers;
/* enable or disable low levels log */
@@ -58,6 +69,12 @@ void qemu_set_log(int log_flags)
#ifdef CONFIG_TRACE_LOG
qemu_loglevel |= LOG_TRACE;
#endif
+
+ /* Is there a better place to call this to init the logfile subsystem? */
+ if (!qemu_logfile_initialized) {
+ qemu_logfile_init();
+ }
+ qemu_mutex_lock(&qemu_logfile_mutex);
if (!qemu_logfile &&
(is_daemonized() ? logfilename != NULL : qemu_loglevel)) {
if (logfilename) {
@@ -93,6 +110,7 @@ void qemu_set_log(int log_flags)
log_append = 1;
}
}
+ qemu_mutex_unlock(&qemu_logfile_mutex);
if (qemu_logfile &&
(is_daemonized() ? logfilename == NULL : !qemu_loglevel)) {
qemu_log_close();
@@ -114,6 +132,11 @@ void qemu_set_log_filename(const char *filename, Error
**errp)
char *pidstr;
g_free(logfilename);
+ /* Is there a better place to call this to init the logfile subsystem? */
+ if (!qemu_logfile_initialized) {
+ qemu_logfile_init();
+ }
+
pidstr = strstr(filename, "%");
if (pidstr) {
/* We only accept one %d, no other format strings */
--
2.17.1