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 #if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0)
  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
 221 static inline gboolean g_hash_table_contains(GHashTable *hash_table,
 222                                              gpointer key)
 223 {
 224     return g_hash_table_lookup_extended(hash_table, key, NULL, NULL);
 225 }
 226 #define G_SOURCE_CONTINUE TRUE
 227 #define G_SOURCE_REMOVE FALSE
 228 #endif
 229
 230 #ifndef g_assert_true
 231 #define g_assert_true(expr)                                                    \
 232     do {                                                                       \
 233         if (G_LIKELY(expr)) {                                                  \
 234         } else {                                                               \
 235             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 236                                 "'" #expr "' should be TRUE");                 \
 237         }                                                                      \
 238     } while (0)
 239 #endif
 240
 241 #ifndef g_assert_false
 242 #define g_assert_false(expr)                                                   \
 243     do {                                                                       \
 244         if (G_LIKELY(!(expr))) {                                               \
 245         } else {                                                               \
 246             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 247                                 "'" #expr "' should be FALSE");                \
 248         }                                                                      \
 249     } while (0)
 250 #endif
 251
 252 #ifndef g_assert_null
 253 #define g_assert_null(expr)                                                    \
 254     do {                                                                       \
 255         if (G_LIKELY((expr) == NULL)) {                                        \
 256         } else {                                                               \
 257             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 258                                 "'" #expr "' should be NULL");                 \
 259         }                                                                      \
 260     } while (0)
 261 #endif
 262
 263 #ifndef g_assert_nonnull
 264 #define g_assert_nonnull(expr)                                                 \
 265     do {                                                                       \
 266         if (G_LIKELY((expr) != NULL)) {                                        \
 267         } else {                                                               \
 268             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 269                                 "'" #expr "' should not be NULL");             \
 270         }                                                                      \
 271     } while (0)
 272 #endif
 273
 274 #ifndef g_assert_cmpmem
 275 #define g_assert_cmpmem(m1, l1, m2, l2)                                        \
 276     do {                                                                       \
 277         gconstpointer __m1 = m1, __m2 = m2;                                    \
 278         int __l1 = l1, __l2 = l2;                                              \
 279         if (__l1 != __l2) {                                                    \
 280             g_assertion_message_cmpnum(                                        \
 281                 G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,                   \
 282                 #l1 " (len(" #m1 ")) == " #l2 " (len(" #m2 "))", __l1, "==",   \
 283                 __l2, 'i');                                                    \
 284         } else if (memcmp(__m1, __m2, __l1) != 0) {                            \
 285             g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC,   \
 286                                 "assertion failed (" #m1 " == " #m2 ")");      \
 287         }                                                                      \
 288     } while (0)
 289 #endif
 290
 291 #if !GLIB_CHECK_VERSION(2, 28, 0)
 292 static inline void g_list_free_full(GList *list, GDestroyNotify free_func)
 293 {
 294     GList *l;
 295
 296     for (l = list; l; l = l->next) {
 297         free_func(l->data);
 298     }
 299
 300     g_list_free(list);
 301 }
 302
 303 static inline void g_slist_free_full(GSList *list, GDestroyNotify free_func)
 304 {
 305     GSList *l;
 306
 307     for (l = list; l; l = l->next) {
 308         free_func(l->data);
 309     }
 310
 311     g_slist_free(list);
 312 }
 313 #endif
 314
 315 #if !GLIB_CHECK_VERSION(2, 26, 0)
 316 static inline void g_source_set_name(GSource *source, const char *name)
 317 {
 318     /* This is just a debugging aid, so leaving it a no-op */
 319 }
 320 static inline void g_source_set_name_by_id(guint tag, const char *name)
 321 {
 322     /* This is just a debugging aid, so leaving it a no-op */
 323 }
 324 #endif
 325
 326 #if !GLIB_CHECK_VERSION(2, 36, 0)
 327 /* Always fail.  This will not include error_report output in the test log,
 328  * sending it instead to stderr.
 329  */
 330 #define g_test_initialized() (0)
 331 #endif
 332 #if !GLIB_CHECK_VERSION(2, 38, 0)
 333 #ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
 334 #error schizophrenic detection of glib subprocess testing
 335 #endif
 336 #define g_test_subprocess() (0)
 337 #endif
 338
 339
 340 #if !GLIB_CHECK_VERSION(2, 34, 0)
 341 static inline void
 342 g_test_add_data_func_full(const char *path,
 343                           gpointer data,
 344                           gpointer fn,
 345                           gpointer data_free_func)
 346 {
 347 #if GLIB_CHECK_VERSION(2, 26, 0)
 348     /* back-compat casts, remove this once we can require new-enough glib */
 349     g_test_add_vtable(path, 0, data, NULL,
 350                       (GTestFixtureFunc)fn, (GTestFixtureFunc) data_free_func);
 351 #else
 352     /* back-compat casts, remove this once we can require new-enough glib */
 353     g_test_add_vtable(path, 0, data, NULL,
 354                       (void (*)(void)) fn, (void (*)(void)) data_free_func);
 355 #endif
 356 }
 357 #endif
 358
 359
 360 #endif