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xemu/include/glib-compat.h
Daniel P. Berrange e93a68e102 char: set name for all I/O channels created 
Ensure that all I/O channels created for character devices
are given names to distinguish their respective roles.

Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-10-27 09:13:10 +02:00

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/*
* 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, 30, 0)
/* Not a 100% compatible implementation, but good enough for most
* cases. Placeholders are only supported at the end of the
* template. */
static inline gchar *qemu_g_dir_make_tmp(gchar const *tmpl, GError **error)
{
gchar *path = g_build_filename(g_get_tmp_dir(), tmpl ?: ".XXXXXX", NULL);
if (mkdtemp(path) != NULL) {
return path;
}
/* Error occurred, clean up. */
g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(errno),
"mkdtemp() failed");
g_free(path);
return NULL;
}
#define g_dir_make_tmp(tmpl, error) qemu_g_dir_make_tmp(tmpl, error)
#endif /* glib 2.30 */
#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
static inline gboolean (g_cond_timed_wait)(CompatGCond *cond,
CompatGMutex *mutex,
GTimeVal *time)
{
g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
g_once(&cond->once, do_g_cond_new, NULL);
return g_cond_timed_wait((GCond *) cond->once.retval,
(GMutex *) mutex->once.retval, time);
}
#undef g_cond_timed_wait
/* This is not a macro, because it didn't exist until 2.32. */
static inline gboolean g_cond_wait_until(CompatGCond *cond, CompatGMutex *mutex,
gint64 end_time)
{
GTimeVal time;
/* Convert from monotonic to CLOCK_REALTIME. */
end_time -= g_get_monotonic_time();
g_get_current_time(&time);
end_time += time.tv_sec * G_TIME_SPAN_SECOND + time.tv_usec;
time.tv_sec = end_time / G_TIME_SPAN_SECOND;
time.tv_usec = end_time % G_TIME_SPAN_SECOND;
return g_cond_timed_wait(cond, mutex, &time);
}
/* 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 */
#if !GLIB_CHECK_VERSION(2, 32, 0)
/* Beware, function returns gboolean since 2.39.2, see GLib commit 9101915 */
static inline void g_hash_table_add(GHashTable *hash_table, gpointer key)
{
g_hash_table_replace(hash_table, key, key);
}
#endif
#ifndef g_assert_true
#define g_assert_true(expr) \
do { \
if (G_LIKELY(expr)) { \
} else { \
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be TRUE"); \
} \
} while (0)
#endif
#ifndef g_assert_false
#define g_assert_false(expr) \
do { \
if (G_LIKELY(!(expr))) { \
} else { \
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be FALSE"); \
} \
} while (0)
#endif
#ifndef g_assert_null
#define g_assert_null(expr) \
do { \
if (G_LIKELY((expr) == NULL)) { \
} else { \
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be NULL"); \
} \
} while (0)
#endif
#ifndef g_assert_nonnull
#define g_assert_nonnull(expr) \
do { \
if (G_LIKELY((expr) != NULL)) { \
} else { \
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should not be NULL"); \
} \
} while (0)
#endif
#ifndef g_assert_cmpmem
#define g_assert_cmpmem(m1, l1, m2, l2) \
do { \
gconstpointer __m1 = m1, __m2 = m2; \
int __l1 = l1, __l2 = l2; \
if (__l1 != __l2) { \
g_assertion_message_cmpnum( \
G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
#l1 " (len(" #m1 ")) == " #l2 " (len(" #m2 "))", __l1, "==", \
__l2, 'i'); \
} else if (memcmp(__m1, __m2, __l1) != 0) { \
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"assertion failed (" #m1 " == " #m2 ")"); \
} \
} while (0)
#endif
#if !GLIB_CHECK_VERSION(2, 28, 0)
static inline void g_list_free_full(GList *list, GDestroyNotify free_func)
{
GList *l;
for (l = list; l; l = l->next) {
free_func(l->data);
}
g_list_free(list);
}
static inline void g_slist_free_full(GSList *list, GDestroyNotify free_func)
{
GSList *l;
for (l = list; l; l = l->next) {
free_func(l->data);
}
g_slist_free(list);
}
#endif
#if !GLIB_CHECK_VERSION(2, 26, 0)
static inline void g_source_set_name(GSource *source, const char *name)
{
/* This is just a debugging aid, so leaving it a no-op */
}
static inline void g_source_set_name_by_id(guint tag, const char *name)
{
/* This is just a debugging aid, so leaving it a no-op */
}
#endif
#endif
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