[Qemu-devel] [PATCH v2 1/2] trace: portable simple trace backend using glib

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

Convert the simple trace backend to glib so that it works under Windows.
We cannot use pthread directly but glib provides portable abstractions.
Also use glib atomics instead of newish gcc builtins which may not be
supported on Windows toolchains.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 trace/simple.c |   70 +++++++++++++++++++++++++++++++++++--------------------
 1 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/trace/simple.c b/trace/simple.c
index a609368..e29e001 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -12,8 +12,10 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <time.h>
+#ifndef _WIN32
 #include <signal.h>
 #include <pthread.h>
+#endif
 #include "qemu-timer.h"
 #include "trace.h"
 #include "trace/control.h"
@@ -54,9 +56,9 @@ enum {
  * Trace records are written out by a dedicated thread.  The thread waits for
  * records to become available, writes them out, and then waits again.
  */
-static pthread_mutex_t trace_lock = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t trace_available_cond = PTHREAD_COND_INITIALIZER;
-static pthread_cond_t trace_empty_cond = PTHREAD_COND_INITIALIZER;
+static GStaticMutex trace_lock = G_STATIC_MUTEX_INIT;
+static GCond *trace_available_cond;
+static GCond *trace_empty_cond;
 static bool trace_available;
 static bool trace_writeout_enabled;
 
@@ -93,29 +95,30 @@ static bool get_trace_record(unsigned int idx, TraceRecord *record)
  */
 static void flush_trace_file(bool wait)
 {
-    pthread_mutex_lock(&trace_lock);
+    g_static_mutex_lock(&trace_lock);
     trace_available = true;
-    pthread_cond_signal(&trace_available_cond);
+    g_cond_signal(trace_available_cond);
 
     if (wait) {
-        pthread_cond_wait(&trace_empty_cond, &trace_lock);
+        g_cond_wait(trace_empty_cond, g_static_mutex_get_mutex(&trace_lock));
     }
 
-    pthread_mutex_unlock(&trace_lock);
+    g_static_mutex_unlock(&trace_lock);
 }
 
 static void wait_for_trace_records_available(void)
 {
-    pthread_mutex_lock(&trace_lock);
+    g_static_mutex_lock(&trace_lock);
     while (!(trace_available && trace_writeout_enabled)) {
-        pthread_cond_signal(&trace_empty_cond);
-        pthread_cond_wait(&trace_available_cond, &trace_lock);
+        g_cond_signal(trace_empty_cond);
+        g_cond_wait(trace_available_cond,
+                    g_static_mutex_get_mutex(&trace_lock));
     }
     trace_available = false;
-    pthread_mutex_unlock(&trace_lock);
+    g_static_mutex_unlock(&trace_lock);
 }
 
-static void *writeout_thread(void *opaque)
+static gpointer writeout_thread(gpointer opaque)
 {
     TraceRecord record;
     unsigned int writeout_idx = 0;
@@ -159,7 +162,7 @@ static void trace(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3,
 
     timestamp = get_clock();
 
-    idx = __sync_fetch_and_add(&trace_idx, 1) % TRACE_BUF_LEN;
+    idx = g_atomic_int_exchange_and_add((gint *)&trace_idx, 1) % TRACE_BUF_LEN;
     trace_buf[idx] = (TraceRecord){
         .event = event,
         .timestamp_ns = timestamp,
@@ -331,28 +334,43 @@ bool trace_event_set_state(const char *name, bool state)
     return false;
 }
 
-bool trace_backend_init(const char *events, const char *file)
+/* Helper function to create a thread with signals blocked */
+static GThread *trace_thread_create(GThreadFunc fn)
 {
-    pthread_t thread;
-    pthread_attr_t attr;
+    GThread *thread;
+#ifndef _WIN32
     sigset_t set, oldset;
-    int ret;
-
-    pthread_attr_init(&attr);
-    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 
     sigfillset(&set);
     pthread_sigmask(SIG_SETMASK, &set, &oldset);
-    ret = pthread_create(&thread, &attr, writeout_thread, NULL);
+#endif
+    thread = g_thread_create(writeout_thread, NULL, FALSE, NULL);
+#ifndef _WIN32
     pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+#endif
+
+    return thread;
+}
+
+bool trace_backend_init(const char *events, const char *file)
+{
+    GThread *thread;
+
+    if (!g_thread_supported()) {
+        g_thread_init(NULL);
+    }
 
-    if (ret != 0) {
+    trace_available_cond = g_cond_new();
+    trace_empty_cond = g_cond_new();
+
+    thread = trace_thread_create(writeout_thread);
+    if (!thread) {
         fprintf(stderr, "warning: unable to initialize simple trace backend\n");
-    } else {
-        atexit(st_flush_trace_buffer);
-        trace_backend_init_events(events);
-        st_set_trace_file(file);
+        return false;
     }
 
+    atexit(st_flush_trace_buffer);
+    trace_backend_init_events(events);
+    st_set_trace_file(file);
     return true;
 }
-- 
1.7.5.4