include/glib-compat.h

   1 /*
   2  * GLIB Compatibility Functions
   3  *
   4  * Copyright IBM, Corp. 2013
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *  Michael Tokarev   <mjt@tls.msk.ru>
   9  *  Paolo Bonzini     <pbonzini@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #ifndef QEMU_GLIB_COMPAT_H
  17 #define QEMU_GLIB_COMPAT_H
  18
  19 #include <glib.h>
  20
  21 /* GLIB version compatibility flags */
  22 #if !GLIB_CHECK_VERSION(2, 26, 0)
  23 #define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT(1000000))
  24 #endif
  25
  26 #if !GLIB_CHECK_VERSION(2, 28, 0)
  27 static inline gint64 qemu_g_get_monotonic_time(void)
  28 {
  29     /* g_get_monotonic_time() is best-effort so we can use the wall clock as a
  30      * fallback.
  31      */
  32
  33     GTimeVal time;
  34     g_get_current_time(&time);
  35
  36     return time.tv_sec * G_TIME_SPAN_SECOND + time.tv_usec;
  37 }
  38 /* work around distro backports of this interface */
  39 #define g_get_monotonic_time() qemu_g_get_monotonic_time()
  40 #endif
  41
  42 #ifdef _WIN32
  43 /*
  44  * g_poll has a problem on Windows when using
  45  * timeouts < 10ms, so use wrapper.
  46  */
  47 #define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
  48 gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
  49 #endif
  50
  51 #if !GLIB_CHECK_VERSION(2, 30, 0)
  52 /* Not a 100% compatible implementation, but good enough for most
  53  * cases. Placeholders are only supported at the end of the
  54  * template. */
  55 static inline gchar *qemu_g_dir_make_tmp(gchar const *tmpl, GError **error)
  56 {
  57     gchar *path = g_build_filename(g_get_tmp_dir(), tmpl ?: ".XXXXXX", NULL);
  58
  59     if (mkdtemp(path) != NULL) {
  60         return path;
  61     }
  62     /* Error occurred, clean up. */
  63     g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(errno),
  64                 "mkdtemp() failed");
  65     g_free(path);
  66     return NULL;
  67 }
  68 #define g_dir_make_tmp(tmpl, error) qemu_g_dir_make_tmp(tmpl, error)
  69 #endif /* glib 2.30 */
  70
  71 #if !GLIB_CHECK_VERSION(2, 31, 0)
  72 /* before glib-2.31, GMutex and GCond was dynamic-only (there was a separate
  73  * GStaticMutex, but it didn't work with condition variables).
  74  *
  75  * Our implementation uses GOnce to fake a static implementation that does
  76  * not require separate initialization.
  77  * We need to rename the types to avoid passing our CompatGMutex/CompatGCond
  78  * by mistake to a function that expects GMutex/GCond.  However, for ease
  79  * of use we keep the GLib function names.  GLib uses macros for the
  80  * implementation, we use inline functions instead and undefine the macros.
  81  */
  82
  83 typedef struct CompatGMutex {
  84     GOnce once;
  85 } CompatGMutex;
  86
  87 typedef struct CompatGCond {
  88     GOnce once;
  89 } CompatGCond;
  90
  91 static inline gpointer do_g_mutex_new(gpointer unused)
  92 {
  93     return (gpointer) g_mutex_new();
  94 }
  95
  96 static inline void g_mutex_init(CompatGMutex *mutex)
  97 {
  98     mutex->once = (GOnce) G_ONCE_INIT;
  99 }
 100
 101 static inline void g_mutex_clear(CompatGMutex *mutex)
 102 {
 103     g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
 104     if (mutex->once.retval) {
 105         g_mutex_free((GMutex *) mutex->once.retval);
 106     }
 107     mutex->once = (GOnce) G_ONCE_INIT;
 108 }
 109
 110 static inline void (g_mutex_lock)(CompatGMutex *mutex)
 111 {
 112     g_once(&mutex->once, do_g_mutex_new, NULL);
 113     g_mutex_lock((GMutex *) mutex->once.retval);
 114 }
 115 #undef g_mutex_lock
 116
 117 static inline gboolean (g_mutex_trylock)(CompatGMutex *mutex)
 118 {
 119     g_once(&mutex->once, do_g_mutex_new, NULL);
 120     return g_mutex_trylock((GMutex *) mutex->once.retval);
 121 }
 122 #undef g_mutex_trylock
 123
 124
 125 static inline void (g_mutex_unlock)(CompatGMutex *mutex)
 126 {
 127     g_mutex_unlock((GMutex *) mutex->once.retval);
 128 }
 129 #undef g_mutex_unlock
 130
 131 static inline gpointer do_g_cond_new(gpointer unused)
 132 {
 133     return (gpointer) g_cond_new();
 134 }
 135
 136 static inline void g_cond_init(CompatGCond *cond)
 137 {
 138     cond->once = (GOnce) G_ONCE_INIT;
 139 }
 140
 141 static inline void g_cond_clear(CompatGCond *cond)
 142 {
 143     g_assert(cond->once.status != G_ONCE_STATUS_PROGRESS);
 144     if (cond->once.retval) {
 145         g_cond_free((GCond *) cond->once.retval);
 146     }
 147     cond->once = (GOnce) G_ONCE_INIT;
 148 }
 149
 150 static inline void (g_cond_wait)(CompatGCond *cond, CompatGMutex *mutex)
 151 {
 152     g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
 153     g_once(&cond->once, do_g_cond_new, NULL);
 154     g_cond_wait((GCond *) cond->once.retval, (GMutex *) mutex->once.retval);
 155 }
 156 #undef g_cond_wait
 157
 158 static inline void (g_cond_broadcast)(CompatGCond *cond)
 159 {
 160     g_once(&cond->once, do_g_cond_new, NULL);
 161     g_cond_broadcast((GCond *) cond->once.retval);
 162 }
 163 #undef g_cond_broadcast
 164
 165 static inline void (g_cond_signal)(CompatGCond *cond)
 166 {
 167     g_once(&cond->once, do_g_cond_new, NULL);
 168     g_cond_signal((GCond *) cond->once.retval);
 169 }
 170 #undef g_cond_signal
 171
 172 static inline gboolean (g_cond_timed_wait)(CompatGCond *cond,
 173                                            CompatGMutex *mutex,
 174                                            GTimeVal *time)
 175 {
 176     g_assert(mutex->once.status != G_ONCE_STATUS_PROGRESS);
 177     g_once(&cond->once, do_g_cond_new, NULL);
 178     return g_cond_timed_wait((GCond *) cond->once.retval,
 179                              (GMutex *) mutex->once.retval, time);
 180 }
 181 #undef g_cond_timed_wait
 182
 183 /* This is not a macro, because it didn't exist until 2.32.  */
 184 static inline gboolean g_cond_wait_until(CompatGCond *cond, CompatGMutex *mutex,
 185                                          gint64 end_time)
 186 {
 187     GTimeVal time;
 188
 189     /* Convert from monotonic to CLOCK_REALTIME.  */
 190     end_time -= g_get_monotonic_time();
 191     g_get_current_time(&time);
 192     end_time += time.tv_sec * G_TIME_SPAN_SECOND + time.tv_usec;
 193
 194     time.tv_sec = end_time / G_TIME_SPAN_SECOND;
 195     time.tv_usec = end_time % G_TIME_SPAN_SECOND;
 196     return g_cond_timed_wait(cond, mutex, &time);
 197 }
 198
 199 /* before 2.31 there was no g_thread_new() */
 200 static inline GThread *g_thread_new(const char *name,
 201                                     GThreadFunc func, gpointer data)
 202 {
 203     GThread *thread = g_thread_create(func, data, TRUE, NULL);
 204     if (!thread) {
 205         g_error("creating thread");
 206     }
 207     return thread;
 208 }
 209 #else
 210 #define CompatGMutex GMutex
 211 #define CompatGCond GCond
 212 #endif /* glib 2.31 */
 213
 214 #if !GLIB_CHECK_VERSION(2, 32, 0)
 215 /* Beware, function returns gboolean since 2.39.2, see GLib commit 9101915 */
 216 static inline void g_hash_table_add(GHashTable *hash_table, gpointer key)
 217 {
 218     g_hash_table_replace(hash_table, key, key);
 219 }
 220 #endif
 221
 222 #ifndef g_assert_true
 223 #define g_assert_true(expr)                                                    \
 224     do {                                                                       \
 225         if (G_LIKELY(expr)) {                                                  \
 226         } else {                                                               \
 227             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 228                                 "'" #expr "' should be TRUE");                 \
 229         }                                                                      \
 230     } while (0)
 231 #endif
 232
 233 #ifndef g_assert_false
 234 #define g_assert_false(expr)                                                   \
 235     do {                                                                       \
 236         if (G_LIKELY(!(expr))) {                                               \
 237         } else {                                                               \
 238             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 239                                 "'" #expr "' should be FALSE");                \
 240         }                                                                      \
 241     } while (0)
 242 #endif
 243
 244 #ifndef g_assert_null
 245 #define g_assert_null(expr)                                                    \
 246     do {                                                                       \
 247         if (G_LIKELY((expr) == NULL)) {                                        \
 248         } else {                                                               \
 249             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 250                                 "'" #expr "' should be NULL");                 \
 251         }                                                                      \
 252     } while (0)
 253 #endif
 254
 255 #ifndef g_assert_nonnull
 256 #define g_assert_nonnull(expr)                                                 \
 257     do {                                                                       \
 258         if (G_LIKELY((expr) != NULL)) {                                        \
 259         } else {                                                               \
 260             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 261                                 "'" #expr "' should not be NULL");             \
 262         }                                                                      \
 263     } while (0)
 264 #endif
 265
 266 #ifndef g_assert_cmpmem
 267 #define g_assert_cmpmem(m1, l1, m2, l2)                                        \
 268     do {                                                                       \
 269         gconstpointer __m1 = m1, __m2 = m2;                                    \
 270         int __l1 = l1, __l2 = l2;                                              \
 271         if (__l1 != __l2) {                                                    \
 272             g_assertion_message_cmpnum(                                        \
 273                 G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,                   \
 274                 #l1 " (len(" #m1 ")) == " #l2 " (len(" #m2 "))", __l1, "==",   \
 275                 __l2, 'i');                                                    \
 276         } else if (memcmp(__m1, __m2, __l1) != 0) {                            \
 277             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 278                                 "assertion failed (" #m1 " == " #m2 ")");      \
 279         }                                                                      \
 280     } while (0)
 281 #endif
 282
 283 #endif