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5045570009
qemu/include/glib-compat.h
Sascha Silbe 5045570009 glib: add compatibility implementation for g_dir_make_tmp() 
We're going to make use of g_dir_make_tmp() in test-logging. Provide a
compatibility implementation of it for glib < 2.30.

May behave differently in some edge cases (e.g. pattern only at the
end of the template, the file name is not part of the error message),
but good enough in practice.

Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Message-id: 1471545963-11720-2-git-send-email-silbe@linux.vnet.ibm.com
[PMM: removed variable "template" which caused compilation failures
 when C++ files include glib-compat.h]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-08-19 12:42:40 +01:00

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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
#endif
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