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migrate per-thread magazine caches from single-thread scenario to first
Thu Jul 12 15:46:40 2007 Tim Janik <timj@imendio.com> * glib/gslice.c: migrate per-thread magazine caches from single-thread scenario to first thread using GSlice after g_thread_init(); based on a patch by Tor Lillqvist, fixes #331853. removed warning about g_thread_init() being called after other glib functions (in particular g_slice* calls), because GSlice can cope with this now and the rest of glib is believed to cope as well. * tests/slice-threadinit.c: new test program which tests GSlice working across g_thread_init() calls. svn path=/trunk/; revision=5629
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ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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Thu Jul 12 15:46:40 2007 Tim Janik <timj@imendio.com>
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* glib/gslice.c: migrate per-thread magazine caches from single-thread
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scenario to first thread using GSlice after g_thread_init(); based on
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a patch by Tor Lillqvist, fixes #331853.
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removed warning about g_thread_init() being called after other glib
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functions (in particular g_slice* calls), because GSlice can cope
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with this now and the rest of glib is believed to cope as well.
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* tests/slice-threadinit.c: new test program which tests GSlice working
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across g_thread_init() calls.
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2007-07-10 Matthias Clasen <mclasen@redhat.com>
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* glib/pltcheck.sh: Add g_once_init_enter to the whitelist of
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@ -372,20 +372,14 @@ void
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_g_slice_thread_init_nomessage (void)
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{
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/* we may not use g_error() or friends here */
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if (sys_page_size)
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{
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const char *pname;
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/* mem_error ("g_thread_init() must be called before GSlice is used, memory corrupted..."); */
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fputs ("\n***MEMORY-WARNING***: ", stderr);
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pname = g_get_prgname();
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fprintf (stderr, "%s[%u]: GSlice: ", pname ? pname : "", getpid());
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fputs ("g_thread_init() must be called before all other GLib functions; "
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"memory corruption due to late invocation of g_thread_init() has been detected; "
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"this program is likely to crash, leak or unexpectedly abort soon...\n", stderr);
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}
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if (!sys_page_size)
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g_slice_init_nomessage();
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else
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{
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/* g_slice_init_nomessage() has been called already, probably due
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* to a g_slice_alloc1() before g_thread_init().
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*/
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}
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private_thread_memory = g_private_new (private_thread_memory_cleanup);
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allocator->magazine_mutex = g_mutex_new();
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allocator->slab_mutex = g_mutex_new();
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@ -429,11 +423,38 @@ thread_memory_from_self (void)
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ThreadMemory *tmem = g_private_get (private_thread_memory);
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if (G_UNLIKELY (!tmem))
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{
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const guint n_magazines = MAX_SLAB_INDEX (allocator);
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tmem = g_malloc0 (sizeof (ThreadMemory) + sizeof (Magazine) * 2 * n_magazines);
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tmem->magazine1 = (Magazine*) (tmem + 1);
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tmem->magazine2 = &tmem->magazine1[n_magazines];
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static ThreadMemory *single_thread_memory = NULL; /* remember single-thread info for multi-threaded case */
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if (single_thread_memory && g_thread_supported ())
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{
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g_mutex_lock (allocator->slab_mutex);
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if (single_thread_memory)
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{
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/* GSlice has been used before g_thread_init(), and now
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* we are running threaded. to cope with it, use the saved
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* thread memory structure from when we weren't threaded.
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*/
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tmem = single_thread_memory;
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single_thread_memory = NULL; /* slab_mutex protected when multi-threaded */
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}
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g_mutex_unlock (allocator->slab_mutex);
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}
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if (!tmem)
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{
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const guint n_magazines = MAX_SLAB_INDEX (allocator);
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tmem = g_malloc0 (sizeof (ThreadMemory) + sizeof (Magazine) * 2 * n_magazines);
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tmem->magazine1 = (Magazine*) (tmem + 1);
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tmem->magazine2 = &tmem->magazine1[n_magazines];
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}
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/* g_private_get/g_private_set works in the single-threaded xor the multi-
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* threaded case. but not *across* g_thread_init(), after multi-thread
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* initialization it returns NULL for previously set single-thread data.
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*/
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g_private_set (private_thread_memory, tmem);
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/* save single-thread thread memory structure, in case we need to
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* pick it up again after multi-thread initialization happened.
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*/
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if (!single_thread_memory && !g_thread_supported ())
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single_thread_memory = tmem; /* no slab_mutex created yet */
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}
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return tmem;
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}
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@ -104,6 +104,7 @@ test_programs = \
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slist-test \
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slice-test \
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slice-color \
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slice-threadinit \
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spawn-test \
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$(spawn_test_win32_gui) \
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strfunc-test \
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@ -175,6 +176,8 @@ slice_test_SOURCES = slice-test.c memchunks.c
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slice_test_LDADD = $(thread_ldadd)
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slice_color_SOURCES = slice-color.c memchunks.c
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slice_color_LDADD = $(thread_ldadd)
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slice_threadinit_SOURCES = slice-threadinit.c
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slice_threadinit_LDADD = $(thread_ldadd)
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spawn_test_LDADD = $(progs_ldadd)
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strfunc_test_LDADD = $(progs_ldadd)
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string_test_LDADD = $(progs_ldadd)
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166
tests/slice-threadinit.c
Normal file
166
tests/slice-threadinit.c
Normal file
@ -0,0 +1,166 @@
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/* slice-threadinit.c - test GSlice across g_thread_init
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* Copyright (C) 2007 Tim Janik
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*
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* This work is provided "as is"; redistribution and modification
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* in whole or in part, in any medium, physical or electronic is
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* permitted without restriction.
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*
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* This work is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* In no event shall the authors or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even
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* if advised of the possibility of such damage.
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*/
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#include <glib.h>
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#define N_PAGES (101) /* number of pages to sample */
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#define SAMPLE_SIZE (7)
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#define PAGE_SIZE (128) /* must be <= minimum GSlice alignment block */
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#define MAGAZINE_PROBES { 77, 265, 347 } /* block sizes hopefully unused by g_thread_init */
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#define MAX_PROBE_TRIALS (1031) /* must be >= maximum magazine size */
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#define ALIGN(size, base) ((base) * (gsize) (((size) + (base) - 1) / (base)))
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static struct {
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void *page;
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void *sample;
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} pages[N_PAGES] = { { NULL, }, };
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static const guint magazine_probes[] = MAGAZINE_PROBES;
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#define N_MAGAZINE_PROBES G_N_ELEMENTS (magazine_probes)
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static void
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release_trash_list (GSList **trash_list,
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gsize block_size)
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{
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while (*trash_list)
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{
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g_slice_free1 (block_size, (*trash_list)->data);
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*trash_list = g_slist_delete_link (*trash_list, *trash_list);
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}
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}
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static GSList *free_list = NULL;
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static gboolean
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allocate_from_known_page (void)
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{
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guint i, j, n_trials = N_PAGES * PAGE_SIZE / SAMPLE_SIZE; /* upper bound */
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for (i = 0; i < n_trials; i++)
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{
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void *b = g_slice_alloc (SAMPLE_SIZE);
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void *p = (void*) (PAGE_SIZE * ((gsize) b / PAGE_SIZE));
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free_list = g_slist_prepend (free_list, b);
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/* find page */
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for (j = 0; j < N_PAGES; j++)
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if (pages[j].page == p)
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return TRUE;
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}
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return FALSE;
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}
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int
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main (int argc,
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char *argv[])
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{
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int j, n_pages = 0;
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void *mps[N_MAGAZINE_PROBES];
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/* probe some magazine sizes */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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mps[j] = g_slice_alloc (magazine_probes[j]);
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/* mps[*] now contains pointers to allocated slices */
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/* allocate blocks from N_PAGES different pages */
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while (n_pages < N_PAGES)
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{
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void *b = g_slice_alloc (SAMPLE_SIZE);
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void *p = (void*) (PAGE_SIZE * ((gsize) b / PAGE_SIZE));
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for (j = 0; j < N_PAGES; j++)
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if (pages[j].page == p)
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break;
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if (j < N_PAGES) /* known page */
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free_list = g_slist_prepend (free_list, b);
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else /* new page */
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{
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j = n_pages++;
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pages[j].page = p;
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pages[j].sample = b;
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}
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}
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/* release intermediate allocations */
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release_trash_list (&free_list, SAMPLE_SIZE);
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/* ensure that we can allocate from known pages */
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if (!allocate_from_known_page())
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g_error ("failed to allocate from magazine/page cache (before g_thread_init)");
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/* release intermediate allocations */
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release_trash_list (&free_list, SAMPLE_SIZE);
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/* release magazine probes to be retained */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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g_slice_free1 (magazine_probes[j], mps[j]);
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/* mps[*] now contains pointers to releaed slices */
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/* ensure probes were retained */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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{
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GSList *trash = NULL;
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guint k;
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for (k = 0; k < MAX_PROBE_TRIALS; k++)
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{
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void *mem = g_slice_alloc (magazine_probes[j]);
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if (mem == mps[j])
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break; /* reallocated previously freed slice */
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trash = g_slist_prepend (trash, mem);
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}
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release_trash_list (&trash, magazine_probes[j]);
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if (k >= MAX_PROBE_TRIALS) /* failed to reallocate slice */
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g_error ("failed to reallocate slice from magazine (before g_thread_init): size=%d", magazine_probes[j]);
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}
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/* mps[*] now contains pointers to reallocated slices */
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/* release magazine probes to be retained across g_thread_init */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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g_slice_free1 (magazine_probes[j], mps[j]);
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/* mps[*] now contains pointers to releaed slices */
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/* initialize threading (should retain allocator state) */
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g_thread_init (NULL);
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/* ensure probes were retained */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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{
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GSList *trash = NULL;
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guint k;
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for (k = 0; k < MAX_PROBE_TRIALS; k++)
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{
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void *mem = g_slice_alloc (magazine_probes[j]);
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if (mem == mps[j])
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break; /* reallocated previously freed slice */
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trash = g_slist_prepend (trash, mem);
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}
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release_trash_list (&trash, magazine_probes[j]);
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if (k >= MAX_PROBE_TRIALS) /* failed to reallocate slice */
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g_error ("failed to reallocate slice from magazine (after g_thread_init): size=%d", magazine_probes[j]);
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}
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/* mps[*] now contains pointers to reallocated slices */
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/* ensure that we can allocate from known pages */
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if (!allocate_from_known_page())
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g_error ("failed to allocate from magazine/page cache (after g_thread_init)");
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/* some cleanups */
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for (j = 0; j < N_MAGAZINE_PROBES; j++)
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g_slice_free1 (magazine_probes[j], mps[j]);
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release_trash_list (&free_list, SAMPLE_SIZE);
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return 0;
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}
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