/* * 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