1 files changed, 168 insertions, 0 deletions
diff --git a/include/glib-compat.h b/include/glib-compat.h
new file mode 100644
index 00000000..318e0003
--- /dev/null
+++ b/include/glib-compat.h
@@ -0,0 +1,168 @@
+/*
+ * GLIB Compatibility Functions
+ *
+ * Copyright IBM, Corp. 2013
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Michael Tokarev   <mjt@tls.msk.ru>
+ *  Paolo Bonzini     <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_GLIB_COMPAT_H
+#define QEMU_GLIB_COMPAT_H
+
+#include <glib.h>
+
+/* GLIB version compatibility flags */
+#if !GLIB_CHECK_VERSION(2, 26, 0)
+#define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT(1000000))
+#endif
+
+#if !GLIB_CHECK_VERSION(2, 28, 0)
+static inline gint64 qemu_g_get_monotonic_time(void)
+{
+    /* g_get_monotonic_time() is best-effort so we can use the wall clock as a
+     * fallback.
+     */
+
+    GTimeVal time;
+    g_get_current_time(&time);
+
+    return time.tv_sec * G_TIME_SPAN_SECOND + time.tv_usec;
+}
+/* work around distro backports of this interface */
+#define g_get_monotonic_time() qemu_g_get_monotonic_time()
+#endif
+
+#ifdef _WIN32
+/*
+ * g_poll has a problem on Windows when using
+ * timeouts < 10ms, so use wrapper.
+ */
+#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
+gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
+#endif
+
+#if !GLIB_CHECK_VERSION(2, 31, 0)
+/* before glib-2.31, GMutex and GCond was dynamic-only (there was a separate
+ * GStaticMutex, but it didn't work with condition variables).
+ *
+ * Our implementation uses GOnce to fake a static implementation that does
+ * not require separate initialization.
+ * We need to rename the types to avoid passing our CompatGMutex/CompatGCond
+ * by mistake to a function that expects GMutex/GCond.  However, for ease
+ * of use we keep the GLib function names.  GLib uses macros for the
+ * implementation, we use inline functions instead and undefine the macros.
+ */
+
+typedef struct CompatGMutex {
+    GOnce once;
+} CompatGMutex;
+
+typedef struct CompatGCond {
+    GOnce once;
+} CompatGCond;
+
+static inline gpointer do_g_mutex_new(gpointer unused)
+{
+    return (gpointer) g_mutex_new();
+}
+
+static inline void g_mutex_init(CompatGMutex *mutex)
+{
+    mutex->once = (GOnce) G_ONCE_INIT;
+}
+
+static inline void g_mutex_clear(CompatGMutex *mutex)
+{
+    g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
+    if (mutex->once.retval) {
+        g_mutex_free((GMutex *) mutex->once.retval);
+    }
+    mutex->once = (GOnce) G_ONCE_INIT;
+}
+
+static inline void (g_mutex_lock)(CompatGMutex *mutex)
+{
+    g_once(&mutex->once, do_g_mutex_new, NULL);
+    g_mutex_lock((GMutex *) mutex->once.retval);
+}
+#undef g_mutex_lock
+
+static inline gboolean (g_mutex_trylock)(CompatGMutex *mutex)
+{
+    g_once(&mutex->once, do_g_mutex_new, NULL);
+    return g_mutex_trylock((GMutex *) mutex->once.retval);
+}
+#undef g_mutex_trylock
+
+
+static inline void (g_mutex_unlock)(CompatGMutex *mutex)
+{
+    g_mutex_unlock((GMutex *) mutex->once.retval);
+}
+#undef g_mutex_unlock
+
+static inline gpointer do_g_cond_new(gpointer unused)
+{
+    return (gpointer) g_cond_new();
+}
+
+static inline void g_cond_init(CompatGCond *cond)
+{
+    cond->once = (GOnce) G_ONCE_INIT;
+}
+
+static inline void g_cond_clear(CompatGCond *cond)
+{
+    g_assert(cond->once.status != G_ONCE_STATUS_PROGRESS);
+    if (cond->once.retval) {
+        g_cond_free((GCond *) cond->once.retval);
+    }
+    cond->once = (GOnce) G_ONCE_INIT;
+}
+
+static inline void (g_cond_wait)(CompatGCond *cond, CompatGMutex *mutex)
+{
+    g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
+    g_once(&cond->once, do_g_cond_new, NULL);
+    g_cond_wait((GCond *) cond->once.retval, (GMutex *) mutex->once.retval);
+}
+#undef g_cond_wait
+
+static inline void (g_cond_broadcast)(CompatGCond *cond)
+{
+    g_once(&cond->once, do_g_cond_new, NULL);
+    g_cond_broadcast((GCond *) cond->once.retval);
+}
+#undef g_cond_broadcast
+
+static inline void (g_cond_signal)(CompatGCond *cond)
+{
+    g_once(&cond->once, do_g_cond_new, NULL);
+    g_cond_signal((GCond *) cond->once.retval);
+}
+#undef g_cond_signal
+
+
+/* before 2.31 there was no g_thread_new() */
+static inline GThread *g_thread_new(const char *name,
+                                    GThreadFunc func, gpointer data)
+{
+    GThread *thread = g_thread_create(func, data, TRUE, NULL);
+    if (!thread) {
+        g_error("creating thread");
+    }
+    return thread;
+}
+#else
+#define CompatGMutex GMutex
+#define CompatGCond GCond
+#endif /* glib 2.31 */
+
+#endif