summaryrefslogtreecommitdiffstats
path: root/doc/src/snippets/code/src_gui_util_qundostack.cpp
diff options
context:
space:
mode:
authorKent Hansen <kent.hansen@nokia.com>2010-04-15 15:22:27 (GMT)
committerKent Hansen <kent.hansen@nokia.com>2010-04-15 15:28:15 (GMT)
commitf62d8eb38d35d394aca01f9ec309a43525afb557 (patch)
tree8a7ec142067b9b825adb2c745b2fee39510ff58a /doc/src/snippets/code/src_gui_util_qundostack.cpp
parent45ec585b46dc71de8a72e3bbc2401f50a2a42a8b (diff)
downloadQt-f62d8eb38d35d394aca01f9ec309a43525afb557.zip
Qt-f62d8eb38d35d394aca01f9ec309a43525afb557.tar.gz
Qt-f62d8eb38d35d394aca01f9ec309a43525afb557.tar.bz2
Add translation context to qsTr() benchmark
That's a more realistic case, since translations are usually tied to a physical script.
Diffstat (limited to 'doc/src/snippets/code/src_gui_util_qundostack.cpp')
0 files changed, 0 insertions, 0 deletions
generated by cgit v0.12 at 2025-05-19 03:19:15 (GMT)
1 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 
#define JEMALLOC_MUTEX_C_
#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"

#include "jemalloc/internal/assert.h"
#include "jemalloc/internal/malloc_io.h"

#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
#include <dlfcn.h>
#endif

#ifndef _CRT_SPINCOUNT
#define _CRT_SPINCOUNT 4000
#endif

/******************************************************************************/
/* Data. */

#ifdef JEMALLOC_LAZY_LOCK
bool isthreaded = false;
#endif
#ifdef JEMALLOC_MUTEX_INIT_CB
static bool		postpone_init = true;
static malloc_mutex_t	*postponed_mutexes = NULL;
#endif

#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
static void	pthread_create_once(void);
#endif

/******************************************************************************/
/*
 * We intercept pthread_create() calls in order to toggle isthreaded if the
 * process goes multi-threaded.
 */

#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
static int (*pthread_create_fptr)(pthread_t *__restrict, const pthread_attr_t *,
    void *(*)(void *), void *__restrict);

static void
pthread_create_once(void) {
	pthread_create_fptr = dlsym(RTLD_NEXT, "pthread_create");
	if (pthread_create_fptr == NULL) {
		malloc_write("<jemalloc>: Error in dlsym(RTLD_NEXT, "
		    "\"pthread_create\")\n");
		abort();
	}

	isthreaded = true;
}

JEMALLOC_EXPORT int
pthread_create(pthread_t *__restrict thread,
    const pthread_attr_t *__restrict attr, void *(*start_routine)(void *),
    void *__restrict arg) {
	static pthread_once_t once_control = PTHREAD_ONCE_INIT;

	pthread_once(&once_control, pthread_create_once);

	return pthread_create_fptr(thread, attr, start_routine, arg);
}
#endif

/******************************************************************************/

#ifdef JEMALLOC_MUTEX_INIT_CB
JEMALLOC_EXPORT int	_pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
    void *(calloc_cb)(size_t, size_t));
#endif

void
malloc_mutex_lock_slow(malloc_mutex_t *mutex) {
	mutex_prof_data_t *data = &mutex->prof_data;
	UNUSED nstime_t before = NSTIME_ZERO_INITIALIZER;

	if (ncpus == 1) {
		goto label_spin_done;
	}

	int cnt = 0, max_cnt = MALLOC_MUTEX_MAX_SPIN;
	do {
		CPU_SPINWAIT;
		if (!malloc_mutex_trylock(mutex)) {
			data->n_spin_acquired++;
			return;
		}
	} while (cnt++ < max_cnt);

	if (!config_stats) {
		/* Only spin is useful when stats is off. */
		malloc_mutex_lock_final(mutex);
		return;
	}
label_spin_done:
	nstime_update(&before);
	/* Copy before to after to avoid clock skews. */
	nstime_t after;
	nstime_copy(&after, &before);
	uint32_t n_thds = atomic_fetch_add_u32(&data->n_waiting_thds, 1,
	    ATOMIC_RELAXED) + 1;
	/* One last try as above two calls may take quite some cycles. */
	if (!malloc_mutex_trylock(mutex)) {
		atomic_fetch_sub_u32(&data->n_waiting_thds, 1, ATOMIC_RELAXED);
		data->n_spin_acquired++;
		return;
	}

	/* True slow path. */
	malloc_mutex_lock_final(mutex);
	/* Update more slow-path only counters. */
	atomic_fetch_sub_u32(&data->n_waiting_thds, 1, ATOMIC_RELAXED);
	nstime_update(&after);

	nstime_t delta;
	nstime_copy(&delta, &after);
	nstime_subtract(&delta, &before);

	data->n_wait_times++;
	nstime_add(&data->tot_wait_time, &delta);
	if (nstime_compare(&data->max_wait_time, &delta) < 0) {
		nstime_copy(&data->max_wait_time, &delta);
	}
	if (n_thds > data->max_n_thds) {
		data->max_n_thds = n_thds;
	}
}

static void
mutex_prof_data_init(mutex_prof_data_t *data) {
	memset(data, 0, sizeof(mutex_prof_data_t));
	data->prev_owner = NULL;
}

void
malloc_mutex_prof_data_reset(tsdn_t *tsdn, malloc_mutex_t *mutex) {
	malloc_mutex_assert_owner(tsdn, mutex);
	mutex_prof_data_init(&mutex->prof_data);
}

bool
malloc_mutex_init(malloc_mutex_t *mutex, const char *name,
    witness_rank_t rank) {
	mutex_prof_data_init(&mutex->prof_data);
#ifdef _WIN32
#  if _WIN32_WINNT >= 0x0600
	InitializeSRWLock(&mutex->lock);
#  else
	if (!InitializeCriticalSectionAndSpinCount(&mutex->lock,
	    _CRT_SPINCOUNT)) {
		return true;
	}
#  endif
#elif (defined(JEMALLOC_OS_UNFAIR_LOCK))
	mutex->lock = OS_UNFAIR_LOCK_INIT;
#elif (defined(JEMALLOC_OSSPIN))
	mutex->lock = 0;
#elif (defined(JEMALLOC_MUTEX_INIT_CB))
	if (postpone_init) {
		mutex->postponed_next = postponed_mutexes;
		postponed_mutexes = mutex;
	} else {
		if (_pthread_mutex_init_calloc_cb(&mutex->lock,
		    bootstrap_calloc) != 0) {
			return true;
		}
	}
#else
	pthread_mutexattr_t attr;

	if (pthread_mutexattr_init(&attr) != 0) {
		return true;
	}
	pthread_mutexattr_settype(&attr, MALLOC_MUTEX_TYPE);
	if (pthread_mutex_init(&mutex->lock, &attr) != 0) {
		pthread_mutexattr_destroy(&attr);
		return true;
	}
	pthread_mutexattr_destroy(&attr);
#endif
	if (config_debug) {
		witness_init(&mutex->witness, name, rank, NULL, NULL);
	}
	return false;
}

void
malloc_mutex_prefork(tsdn_t *tsdn, malloc_mutex_t *mutex) {
	malloc_mutex_lock(tsdn, mutex);
}

void
malloc_mutex_postfork_parent(tsdn_t *tsdn, malloc_mutex_t *mutex) {
	malloc_mutex_unlock(tsdn, mutex);
}

void
malloc_mutex_postfork_child(tsdn_t *tsdn, malloc_mutex_t *mutex) {
#ifdef JEMALLOC_MUTEX_INIT_CB
	malloc_mutex_unlock(tsdn, mutex);
#else
	if (malloc_mutex_init(mutex, mutex->witness.name,
	    mutex->witness.rank)) {
		malloc_printf("<jemalloc>: Error re-initializing mutex in "
		    "child\n");
		if (opt_abort) {
			abort();
		}
	}
#endif
}

bool
malloc_mutex_boot(void) {
#ifdef JEMALLOC_MUTEX_INIT_CB
	postpone_init = false;
	while (postponed_mutexes != NULL) {
		if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock,
		    bootstrap_calloc) != 0) {
			return true;
		}
		postponed_mutexes = postponed_mutexes->postponed_next;
	}
#endif
	return false;
}
generated by cgit v0.12 at 2025-05-19 03:19:15 (GMT)