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init.c
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init.c
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/*
* Copyright (c) 2008-2013 Apple Inc. All rights reserved.
*
* @APPLE_APACHE_LICENSE_HEADER_START@
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @APPLE_APACHE_LICENSE_HEADER_END@
*/
// Contains exported global data and initialization & other routines that must
// only exist once in the shared library even when resolvers are used.
// NOTE: this file must not contain any atomic operations
#include "internal.h"
#if HAVE_MACH
#include "protocolServer.h"
#endif
#ifdef __linux__
// The clang compiler in Ubuntu 18.04 has a bug that causes it to crash
// when compiling _dispatch_bug_kevent_vanished(). As a workaround, use a
// less capable version of this function on Linux until a fixed version
// of the compiler is available.
#define RDAR_49023449 1
#endif // __linux__
#pragma mark -
#pragma mark dispatch_init
#if USE_LIBDISPATCH_INIT_CONSTRUCTOR
DISPATCH_NOTHROW __attribute__((constructor))
void
_libdispatch_init(void);
DISPATCH_NOTHROW
void
_libdispatch_init(void)
{
libdispatch_init();
}
#endif
#if !defined(_WIN32)
DISPATCH_EXPORT DISPATCH_NOTHROW
void
dispatch_atfork_prepare(void)
{
_voucher_atfork_prepare();
_os_object_atfork_prepare();
}
DISPATCH_EXPORT DISPATCH_NOTHROW
void
dispatch_atfork_parent(void)
{
_os_object_atfork_parent();
_voucher_atfork_parent();
}
DISPATCH_EXPORT DISPATCH_NOTHROW
void
dispatch_atfork_child(void)
{
_os_object_atfork_child();
_voucher_atfork_child();
_dispatch_event_loop_atfork_child();
if (_dispatch_is_multithreaded_inline()) {
_dispatch_child_of_unsafe_fork = true;
}
_dispatch_queue_atfork_child();
// clear the _PROHIBIT and _MULTITHREADED bits if set
_dispatch_unsafe_fork = 0;
}
int
_dispatch_sigmask(void)
{
sigset_t mask;
int r = 0;
/* Workaround: 6269619 Not all signals can be delivered on any thread */
r |= sigfillset(&mask);
r |= sigdelset(&mask, SIGILL);
r |= sigdelset(&mask, SIGTRAP);
#if HAVE_DECL_SIGEMT
r |= sigdelset(&mask, SIGEMT);
#endif
r |= sigdelset(&mask, SIGFPE);
r |= sigdelset(&mask, SIGBUS);
r |= sigdelset(&mask, SIGSEGV);
r |= sigdelset(&mask, SIGSYS);
r |= sigdelset(&mask, SIGPIPE);
r |= sigdelset(&mask, SIGPROF);
r |= pthread_sigmask(SIG_BLOCK, &mask, NULL);
return dispatch_assume_zero(r);
}
#endif
#pragma mark -
#pragma mark dispatch_globals
DISPATCH_HIDE_SYMBOL(dispatch_assert_queue, 10.12, 10.0, 10.0, 3.0, 1.0);
DISPATCH_HIDE_SYMBOL(dispatch_assert_queue_not, 10.12, 10.0, 10.0, 3.0, 1.0);
DISPATCH_HIDE_SYMBOL(dispatch_queue_create_with_target, 10.12, 10.0, 10.0, 3.0, 1.0);
#if DISPATCH_COCOA_COMPAT
void *(*_dispatch_begin_NSAutoReleasePool)(void);
void (*_dispatch_end_NSAutoReleasePool)(void *);
#endif
#if DISPATCH_USE_THREAD_LOCAL_STORAGE
_Thread_local struct dispatch_tsd __dispatch_tsd;
#if defined(_WIN32)
DWORD __dispatch_tsd_key;
#else
pthread_key_t __dispatch_tsd_key;
#endif
#elif !DISPATCH_USE_DIRECT_TSD
pthread_key_t dispatch_queue_key;
pthread_key_t dispatch_frame_key;
pthread_key_t dispatch_cache_key;
pthread_key_t dispatch_context_key;
pthread_key_t dispatch_pthread_root_queue_observer_hooks_key;
pthread_key_t dispatch_basepri_key;
#if DISPATCH_INTROSPECTION
pthread_key_t dispatch_introspection_key;
#elif DISPATCH_PERF_MON
pthread_key_t dispatch_bcounter_key;
#endif
pthread_key_t dispatch_wlh_key;
pthread_key_t dispatch_voucher_key;
pthread_key_t dispatch_deferred_items_key;
pthread_key_t dispatch_enqueue_key;
pthread_key_t dispatch_msgv_aux_key;
pthread_key_t os_workgroup_key;
#endif // !DISPATCH_USE_DIRECT_TSD && !DISPATCH_USE_THREAD_LOCAL_STORAGE
#if VOUCHER_USE_MACH_VOUCHER
dispatch_once_t _voucher_task_mach_voucher_pred;
mach_voucher_t _voucher_task_mach_voucher;
#if !VOUCHER_USE_EMPTY_MACH_BASE_VOUCHER
mach_voucher_t _voucher_default_task_mach_voucher;
#endif
dispatch_once_t _firehose_task_buffer_pred;
firehose_buffer_t _firehose_task_buffer;
const uint32_t _firehose_spi_version = OS_FIREHOSE_SPI_VERSION;
uint64_t _voucher_unique_pid;
voucher_activity_hooks_t _voucher_libtrace_hooks;
dispatch_mach_t _voucher_activity_debug_channel;
#endif
dispatch_once_t _voucher_process_can_use_arbitrary_personas_pred;
bool _voucher_process_can_use_arbitrary_personas = false;
#if HAVE_PTHREAD_WORKQUEUE_QOS && DISPATCH_DEBUG
bool _dispatch_set_qos_class_enabled;
#endif
#if DISPATCH_USE_KEVENT_WORKQUEUE && DISPATCH_USE_MGR_THREAD
bool _dispatch_kevent_workqueue_enabled = 1;
#endif
DISPATCH_HW_CONFIG();
uint8_t _dispatch_unsafe_fork;
uint8_t _dispatch_mode = DISPATCH_MODE_NO_FAULTS;
bool _dispatch_child_of_unsafe_fork;
#if DISPATCH_USE_MEMORYPRESSURE_SOURCE
bool _dispatch_memory_warn;
int _dispatch_continuation_cache_limit = DISPATCH_CONTINUATION_CACHE_LIMIT;
#endif
DISPATCH_NOINLINE
bool
_dispatch_is_multithreaded(void)
{
return _dispatch_is_multithreaded_inline();
}
DISPATCH_NOINLINE
bool
_dispatch_is_fork_of_multithreaded_parent(void)
{
return _dispatch_child_of_unsafe_fork;
}
const struct dispatch_queue_offsets_s dispatch_queue_offsets = {
.dqo_version = 6,
.dqo_label = offsetof(struct dispatch_queue_s, dq_label),
.dqo_label_size = sizeof(((dispatch_queue_t)NULL)->dq_label),
.dqo_flags = 0,
.dqo_flags_size = 0,
.dqo_serialnum = offsetof(struct dispatch_queue_s, dq_serialnum),
.dqo_serialnum_size = sizeof(((dispatch_queue_t)NULL)->dq_serialnum),
.dqo_width = offsetof(struct dispatch_queue_s, dq_width),
.dqo_width_size = sizeof(((dispatch_queue_t)NULL)->dq_width),
.dqo_running = 0,
.dqo_running_size = 0,
.dqo_suspend_cnt = 0,
.dqo_suspend_cnt_size = 0,
.dqo_target_queue = offsetof(struct dispatch_queue_s, do_targetq),
.dqo_target_queue_size = sizeof(((dispatch_queue_t)NULL)->do_targetq),
.dqo_priority = 0,
.dqo_priority_size = 0,
};
#if TARGET_OS_MAC
const struct dispatch_allocator_layout_s dispatch_allocator_layout = {
.dal_version = 1,
#if DISPATCH_ALLOCATOR
.dal_allocator_zone = &_dispatch_main_heap,
.dal_deferred_free_isa = &_dispatch_main_heap,
.dal_allocation_size = DISPATCH_CONTINUATION_SIZE,
.dal_magazine_size = BYTES_PER_MAGAZINE,
#if PACK_FIRST_PAGE_WITH_CONTINUATIONS
.dal_first_allocation_offset =
offsetof(struct dispatch_magazine_s, fp_conts),
#else
.dal_first_allocation_offset =
offsetof(struct dispatch_magazine_s, conts),
#endif
.dal_allocation_isa_offset =
offsetof(struct dispatch_continuation_s, dc_flags),
.dal_enumerator = &_dispatch_allocator_enumerate,
#endif // DISPATCH_ALLOCATOR
};
#endif
#if DISPATCH_USE_DIRECT_TSD
const struct dispatch_tsd_indexes_s dispatch_tsd_indexes = {
.dti_version = 3,
.dti_queue_index = dispatch_queue_key,
.dti_voucher_index = dispatch_voucher_key,
.dti_qos_class_index = dispatch_priority_key,
.dti_continuation_cache_index = dispatch_cache_key,
};
#endif // DISPATCH_USE_DIRECT_TSD
// 6618342 Contact the team that owns the Instrument DTrace probe before
// renaming this symbol
struct dispatch_queue_static_s _dispatch_main_q = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_main),
#if !DISPATCH_USE_RESOLVERS
.do_targetq = _dispatch_get_default_queue(true),
#endif
.dq_state = DISPATCH_QUEUE_STATE_INIT_VALUE(1) |
DISPATCH_QUEUE_ROLE_BASE_ANON,
.dq_label = "com.apple.main-thread",
.dq_atomic_flags = DQF_THREAD_BOUND | DQF_WIDTH(1),
.dq_serialnum = 1,
};
#if DISPATCH_USE_MGR_THREAD && DISPATCH_USE_PTHREAD_ROOT_QUEUES
static struct dispatch_pthread_root_queue_context_s
_dispatch_mgr_root_queue_pthread_context;
struct dispatch_queue_global_s _dispatch_mgr_root_queue = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_global),
.dq_state = DISPATCH_ROOT_QUEUE_STATE_INIT_VALUE,
.do_ctxt = &_dispatch_mgr_root_queue_pthread_context,
.dq_label = "com.apple.root.libdispatch-manager",
.dq_atomic_flags = DQF_WIDTH(DISPATCH_QUEUE_WIDTH_POOL),
.dq_priority = DISPATCH_PRIORITY_FLAG_MANAGER |
DISPATCH_PRIORITY_SATURATED_OVERRIDE,
.dq_serialnum = 3,
.dgq_thread_pool_size = 1,
};
#else
#define _dispatch_mgr_root_queue _dispatch_root_queues[\
DISPATCH_ROOT_QUEUE_IDX_USER_INTERACTIVE_QOS_OVERCOMMIT]
#endif
// 6618342 Contact the team that owns the Instrument DTrace probe before
// renaming this symbol
struct dispatch_queue_static_s _dispatch_mgr_q = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_mgr),
.dq_state = DISPATCH_QUEUE_STATE_INIT_VALUE(1) |
DISPATCH_QUEUE_ROLE_BASE_ANON,
.do_ctxt = (void *)-1,
.do_targetq = _dispatch_mgr_root_queue._as_dq,
.dq_label = "com.apple.libdispatch-manager",
.dq_atomic_flags = DQF_WIDTH(1),
.dq_priority = DISPATCH_PRIORITY_FLAG_MANAGER |
DISPATCH_PRIORITY_SATURATED_OVERRIDE,
.dq_serialnum = 2,
};
#if DISPATCH_USE_INTERNAL_WORKQUEUE
static struct dispatch_pthread_root_queue_context_s
_dispatch_pthread_root_queue_contexts[DISPATCH_ROOT_QUEUE_COUNT];
#define _dispatch_root_queue_ctxt(n) &_dispatch_pthread_root_queue_contexts[n]
#else
#define _dispatch_root_queue_ctxt(n) NULL
#endif // DISPATCH_USE_INTERNAL_WORKQUEUE
// 6618342 Contact the team that owns the Instrument DTrace probe before
// renaming this symbol
struct dispatch_queue_global_s _dispatch_root_queues[] = {
#define _DISPATCH_ROOT_QUEUE_IDX(n, flags) \
(((flags) & DISPATCH_PRIORITY_FLAG_OVERCOMMIT) ? \
DISPATCH_ROOT_QUEUE_IDX_##n##_QOS_OVERCOMMIT : \
(((flags) & DISPATCH_PRIORITY_FLAG_COOPERATIVE) ? \
DISPATCH_ROOT_QUEUE_IDX_##n##_QOS_COOPERATIVE : \
DISPATCH_ROOT_QUEUE_IDX_##n##_QOS))
#define _DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(n, flags, ...) \
[_DISPATCH_ROOT_QUEUE_IDX(n, flags)] = { \
DISPATCH_GLOBAL_OBJECT_HEADER(queue_global), \
.dq_state = DISPATCH_ROOT_QUEUE_STATE_INIT_VALUE, \
.do_ctxt = _dispatch_root_queue_ctxt(_DISPATCH_ROOT_QUEUE_IDX(n, flags)), \
.dq_atomic_flags = DQF_WIDTH(DISPATCH_QUEUE_WIDTH_POOL), \
.dq_priority = flags | ((flags & DISPATCH_PRIORITY_FLAG_FALLBACK) ? \
_dispatch_priority_make_fallback(DISPATCH_QOS_##n) : \
_dispatch_priority_make(DISPATCH_QOS_##n, 0)), \
__VA_ARGS__ \
}
#if DISPATCH_USE_COOPERATIVE_WORKQUEUE
#define _DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(n, flags, ...) \
[_DISPATCH_ROOT_QUEUE_IDX(n, flags)] = { \
DISPATCH_GLOBAL_OBJECT_HEADER(queue_cooperative), \
.dq_state = DISPATCH_ROOT_QUEUE_STATE_INIT_VALUE, \
.do_ctxt = NULL, \
.dq_atomic_flags = DQF_WIDTH(DISPATCH_QUEUE_WIDTH_POOL), \
.dq_priority = flags | ((flags & DISPATCH_PRIORITY_FLAG_FALLBACK) ? \
_dispatch_priority_make_fallback(DISPATCH_QOS_##n) : \
_dispatch_priority_make(DISPATCH_QOS_##n, 0)), \
__VA_ARGS__ \
}
#else /* DISPATCH_USE_COOPERATIVE_WORKQUEUE */
/* We initialize the rest of the fields in
* _dispatch_cooperative_root_queue_init_fallback */
#define _DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(n, flags, ...) \
[_DISPATCH_ROOT_QUEUE_IDX(n, flags)] = { \
.do_vtable = DISPATCH_VTABLE(queue_concurrent), \
.dq_priority = flags | ((flags & DISPATCH_PRIORITY_FLAG_FALLBACK) ? \
_dispatch_priority_make_fallback(DISPATCH_QOS_##n) : \
_dispatch_priority_make(DISPATCH_QOS_##n, 0)), \
__VA_ARGS__ \
}
#endif /* DISPATCH_USE_COOPERATIVE_WORKQUEUE */
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(MAINTENANCE, 0,
.dq_label = "com.apple.root.maintenance-qos",
.dq_serialnum = 4,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(MAINTENANCE, DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.maintenance-qos.overcommit",
.dq_serialnum = 5,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(MAINTENANCE, DISPATCH_PRIORITY_FLAG_COOPERATIVE,
.dq_label = "com.apple.root.maintenance-qos.cooperative",
.dq_serialnum = 6,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(BACKGROUND, 0,
.dq_label = "com.apple.root.background-qos",
.dq_serialnum = 7,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(BACKGROUND, DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.background-qos.overcommit",
.dq_serialnum = 8,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(BACKGROUND, DISPATCH_PRIORITY_FLAG_COOPERATIVE,
.dq_label = "com.apple.root.background-qos.cooperative",
.dq_serialnum = 9,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(UTILITY, 0,
.dq_label = "com.apple.root.utility-qos",
.dq_serialnum = 10,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(UTILITY, DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.utility-qos.overcommit",
.dq_serialnum = 11,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(UTILITY, DISPATCH_PRIORITY_FLAG_COOPERATIVE,
.dq_label = "com.apple.root.utility-qos.cooperative",
.dq_serialnum = 12,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(DEFAULT, DISPATCH_PRIORITY_FLAG_FALLBACK,
.dq_label = "com.apple.root.default-qos",
.dq_serialnum = 13,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(DEFAULT,
DISPATCH_PRIORITY_FLAG_FALLBACK | DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.default-qos.overcommit",
.dq_serialnum = 14,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(DEFAULT,
DISPATCH_PRIORITY_FLAG_COOPERATIVE | DISPATCH_PRIORITY_FLAG_FALLBACK,
.dq_label = "com.apple.root.default-qos.cooperative",
.dq_serialnum = 15,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(USER_INITIATED, 0,
.dq_label = "com.apple.root.user-initiated-qos",
.dq_serialnum = 16,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(USER_INITIATED, DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.user-initiated-qos.overcommit",
.dq_serialnum = 17,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(USER_INITIATED, DISPATCH_PRIORITY_FLAG_COOPERATIVE,
.dq_label = "com.apple.root.user-initiated-qos.cooperative",
.dq_serialnum = 18,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(USER_INTERACTIVE, 0,
.dq_label = "com.apple.root.user-interactive-qos",
.dq_serialnum = 19,
),
_DISPATCH_GLOBAL_ROOT_QUEUE_ENTRY(USER_INTERACTIVE, DISPATCH_PRIORITY_FLAG_OVERCOMMIT,
.dq_label = "com.apple.root.user-interactive-qos.overcommit",
.dq_serialnum = 20,
),
_DISPATCH_COOPERATIVE_ROOT_QUEUE_ENTRY(USER_INTERACTIVE, DISPATCH_PRIORITY_FLAG_COOPERATIVE,
.dq_label = "com.apple.root.user-interactive-qos.cooperative",
.dq_serialnum = 21,
),
};
__dispatch_is_array(_dispatch_root_queues);
_Static_assert(sizeof(_dispatch_root_queues) ==
sizeof(struct dispatch_queue_global_s) * DISPATCH_ROOT_QUEUE_COUNT,
"_dispatch_root_queues array size mismatch");
const struct dispatch_queue_global_s _dispatch_custom_workloop_root_queue = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_global),
.dq_state = DISPATCH_ROOT_QUEUE_STATE_INIT_VALUE,
.do_ctxt = NULL,
.dq_label = "com.apple.root.workloop-custom",
.dq_atomic_flags = DQF_WIDTH(DISPATCH_QUEUE_WIDTH_POOL),
.dq_priority = _dispatch_priority_make_fallback(DISPATCH_QOS_DEFAULT) |
DISPATCH_PRIORITY_SATURATED_OVERRIDE,
.dq_serialnum = DISPATCH_QUEUE_SERIAL_NUMBER_WLF,
.dgq_thread_pool_size = 1,
};
unsigned long volatile _dispatch_queue_serial_numbers =
DISPATCH_QUEUE_SERIAL_NUMBER_INIT;
dispatch_queue_t
dispatch_get_current_queue(void)
{
return _dispatch_queue_get_current_or_default();
}
#pragma mark -
#pragma mark dispatch_queue_attr_t
// DISPATCH_QUEUE_CONCURRENT resp. _dispatch_queue_attr_concurrent is aliased
// to array member [0] and their properties must match!
const struct dispatch_queue_attr_s _dispatch_queue_attrs[] = {
[0 ... DISPATCH_QUEUE_ATTR_COUNT - 1] = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_attr),
},
};
#if DISPATCH_VARIANT_STATIC
// <rdar://problem/16778703>
struct dispatch_queue_attr_s _dispatch_queue_attr_concurrent = {
DISPATCH_GLOBAL_OBJECT_HEADER(queue_attr),
};
#endif // DISPATCH_VARIANT_STATIC
// _dispatch_queue_attr_concurrent is aliased using libdispatch.aliases
// and the -alias_list linker option on Darwin but needs to be done manually
// for other platforms.
#ifndef __APPLE__
extern struct dispatch_queue_attr_s _dispatch_queue_attr_concurrent
__attribute__((__alias__("_dispatch_queue_attrs")));
#endif
dispatch_queue_attr_info_t
_dispatch_queue_attr_to_info(dispatch_queue_attr_t dqa)
{
dispatch_queue_attr_info_t dqai = { };
if (!dqa) return dqai;
#if DISPATCH_VARIANT_STATIC
if (dqa == &_dispatch_queue_attr_concurrent) {
dqai.dqai_concurrent = true;
return dqai;
}
#endif
if (dqa < _dispatch_queue_attrs ||
dqa >= &_dispatch_queue_attrs[DISPATCH_QUEUE_ATTR_COUNT]) {
#ifndef __APPLE__
if (memcmp(dqa, &_dispatch_queue_attrs[0],
sizeof(struct dispatch_queue_attr_s)) == 0) {
dqa = (dispatch_queue_attr_t)&_dispatch_queue_attrs[0];
} else
#endif // __APPLE__
DISPATCH_CLIENT_CRASH(dqa->do_vtable, "Invalid queue attribute");
}
size_t idx = (size_t)(dqa - _dispatch_queue_attrs);
dqai.dqai_inactive = (idx % DISPATCH_QUEUE_ATTR_INACTIVE_COUNT);
idx /= DISPATCH_QUEUE_ATTR_INACTIVE_COUNT;
dqai.dqai_concurrent = !(idx % DISPATCH_QUEUE_ATTR_CONCURRENCY_COUNT);
idx /= DISPATCH_QUEUE_ATTR_CONCURRENCY_COUNT;
dqai.dqai_relpri = -(int)(idx % DISPATCH_QUEUE_ATTR_PRIO_COUNT);
idx /= DISPATCH_QUEUE_ATTR_PRIO_COUNT;
dqai.dqai_qos = idx % DISPATCH_QUEUE_ATTR_QOS_COUNT;
idx /= DISPATCH_QUEUE_ATTR_QOS_COUNT;
dqai.dqai_autorelease_frequency =
idx % DISPATCH_QUEUE_ATTR_AUTORELEASE_FREQUENCY_COUNT;
idx /= DISPATCH_QUEUE_ATTR_AUTORELEASE_FREQUENCY_COUNT;
dqai.dqai_overcommit = idx % DISPATCH_QUEUE_ATTR_OVERCOMMIT_COUNT;
idx /= DISPATCH_QUEUE_ATTR_OVERCOMMIT_COUNT;
return dqai;
}
static dispatch_queue_attr_t
_dispatch_queue_attr_from_info(dispatch_queue_attr_info_t dqai)
{
size_t idx = 0;
idx *= DISPATCH_QUEUE_ATTR_OVERCOMMIT_COUNT;
idx += dqai.dqai_overcommit;
idx *= DISPATCH_QUEUE_ATTR_AUTORELEASE_FREQUENCY_COUNT;
idx += dqai.dqai_autorelease_frequency;
idx *= DISPATCH_QUEUE_ATTR_QOS_COUNT;
idx += dqai.dqai_qos;
idx *= DISPATCH_QUEUE_ATTR_PRIO_COUNT;
idx += (size_t)(-dqai.dqai_relpri);
idx *= DISPATCH_QUEUE_ATTR_CONCURRENCY_COUNT;
idx += !dqai.dqai_concurrent;
idx *= DISPATCH_QUEUE_ATTR_INACTIVE_COUNT;
idx += dqai.dqai_inactive;
return (dispatch_queue_attr_t)&_dispatch_queue_attrs[idx];
}
dispatch_queue_attr_t
dispatch_queue_attr_make_with_qos_class(dispatch_queue_attr_t dqa,
dispatch_qos_class_t qos_class, int relpri)
{
if (!_dispatch_qos_class_valid(qos_class, relpri)) {
return (dispatch_queue_attr_t)dqa;
}
dispatch_queue_attr_info_t dqai = _dispatch_queue_attr_to_info(dqa);
dqai.dqai_qos = _dispatch_qos_from_qos_class(qos_class);
dqai.dqai_relpri = relpri;
return _dispatch_queue_attr_from_info(dqai);
}
dispatch_queue_attr_t
dispatch_queue_attr_make_initially_inactive(dispatch_queue_attr_t dqa)
{
dispatch_queue_attr_info_t dqai = _dispatch_queue_attr_to_info(dqa);
dqai.dqai_inactive = true;
return _dispatch_queue_attr_from_info(dqai);
}
dispatch_queue_attr_t
dispatch_queue_attr_make_with_overcommit(dispatch_queue_attr_t dqa,
bool overcommit)
{
dispatch_queue_attr_info_t dqai = _dispatch_queue_attr_to_info(dqa);
if (overcommit) {
dqai.dqai_overcommit = _dispatch_queue_attr_overcommit_enabled;
} else {
dqai.dqai_overcommit = _dispatch_queue_attr_overcommit_disabled;
}
return _dispatch_queue_attr_from_info(dqai);
}
dispatch_queue_attr_t
dispatch_queue_attr_make_with_autorelease_frequency(dispatch_queue_attr_t dqa,
dispatch_autorelease_frequency_t frequency)
{
switch (frequency) {
case DISPATCH_AUTORELEASE_FREQUENCY_INHERIT:
case DISPATCH_AUTORELEASE_FREQUENCY_WORK_ITEM:
case DISPATCH_AUTORELEASE_FREQUENCY_NEVER:
break;
}
dispatch_queue_attr_info_t dqai = _dispatch_queue_attr_to_info(dqa);
dqai.dqai_autorelease_frequency = (uint16_t)frequency;
return _dispatch_queue_attr_from_info(dqai);
}
#pragma mark -
#pragma mark dispatch_vtables
DISPATCH_NOINLINE
static void
_dispatch_object_no_dispose(dispatch_object_t dou,
DISPATCH_UNUSED bool *allow_free)
{
DISPATCH_INTERNAL_CRASH(dx_type(dou._do), "do_dispose called");
}
DISPATCH_NOINLINE
static size_t
_dispatch_object_missing_debug(DISPATCH_UNUSED dispatch_object_t dou,
char *buf, size_t bufsiz)
{
return strlcpy(buf, "missing do_debug vtable slot: ", bufsiz);
}
DISPATCH_NOINLINE
static void
_dispatch_object_no_invoke(dispatch_object_t dou,
DISPATCH_UNUSED dispatch_invoke_context_t dic,
DISPATCH_UNUSED dispatch_invoke_flags_t flags)
{
DISPATCH_INTERNAL_CRASH(dx_type(dou._do), "do_invoke called");
}
/*
* Dispatch object cluster
*/
DISPATCH_VTABLE_INSTANCE(semaphore,
.do_type = DISPATCH_SEMAPHORE_TYPE,
.do_dispose = _dispatch_semaphore_dispose,
.do_debug = _dispatch_semaphore_debug,
.do_invoke = _dispatch_object_no_invoke,
);
DISPATCH_VTABLE_INSTANCE(group,
.do_type = DISPATCH_GROUP_TYPE,
.do_dispose = _dispatch_group_dispose,
.do_debug = _dispatch_group_debug,
.do_invoke = _dispatch_object_no_invoke,
);
#if !DISPATCH_DATA_IS_BRIDGED_TO_NSDATA
DISPATCH_VTABLE_INSTANCE(data,
.do_type = DISPATCH_DATA_TYPE,
.do_dispose = _dispatch_data_dispose,
.do_debug = _dispatch_data_debug,
.do_invoke = _dispatch_object_no_invoke,
);
#endif
DISPATCH_VTABLE_INSTANCE(queue_attr,
.do_type = DISPATCH_QUEUE_ATTR_TYPE,
.do_dispose = _dispatch_object_no_dispose,
.do_debug = _dispatch_object_missing_debug,
.do_invoke = _dispatch_object_no_invoke,
);
#if HAVE_MACH
DISPATCH_VTABLE_INSTANCE(mach_msg,
.do_type = DISPATCH_MACH_MSG_TYPE,
.do_dispose = _dispatch_mach_msg_dispose,
.do_debug = _dispatch_mach_msg_debug,
.do_invoke = _dispatch_mach_msg_invoke,
);
#endif // HAVE_MACH
DISPATCH_VTABLE_INSTANCE(io,
.do_type = DISPATCH_IO_TYPE,
.do_dispose = _dispatch_io_dispose,
.do_debug = _dispatch_io_debug,
.do_invoke = _dispatch_object_no_invoke,
);
DISPATCH_VTABLE_INSTANCE(operation,
.do_type = DISPATCH_OPERATION_TYPE,
.do_dispose = _dispatch_operation_dispose,
.do_debug = _dispatch_operation_debug,
.do_invoke = _dispatch_object_no_invoke,
);
DISPATCH_VTABLE_INSTANCE(disk,
.do_type = DISPATCH_DISK_TYPE,
.do_dispose = _dispatch_disk_dispose,
.do_debug = _dispatch_object_missing_debug,
.do_invoke = _dispatch_object_no_invoke,
);
/*
* Dispatch queue cluster
*/
DISPATCH_NOINLINE
static void
_dispatch_queue_no_activate(dispatch_queue_class_t dqu)
{
DISPATCH_INTERNAL_CRASH(dx_type(dqu._dq), "dq_activate called");
}
DISPATCH_VTABLE_INSTANCE(queue,
// This is the base class for queues, no objects of this type are made
.do_type = _DISPATCH_QUEUE_CLUSTER,
.do_dispose = _dispatch_object_no_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_object_no_invoke,
.dq_activate = _dispatch_queue_no_activate,
);
DISPATCH_VTABLE_INSTANCE(workloop,
.do_type = DISPATCH_WORKLOOP_TYPE,
.do_dispose = _dispatch_workloop_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_workloop_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_workloop_wakeup,
.dq_push = _dispatch_workloop_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_serial_executor, lane,
.do_type = DISPATCH_QUEUE_SERIAL_TYPE,
.do_dispose = _dispatch_lane_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_lane_invoke,
.dq_activate = _dispatch_lane_activate,
.dq_wakeup = _dispatch_lane_wakeup,
.dq_push = _dispatch_lane_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_serial, lane,
.do_type = DISPATCH_QUEUE_SERIAL_TYPE,
.do_dispose = _dispatch_lane_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_lane_invoke,
.dq_activate = _dispatch_lane_activate,
.dq_wakeup = _dispatch_lane_wakeup,
.dq_push = _dispatch_lane_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_concurrent, lane,
.do_type = DISPATCH_QUEUE_CONCURRENT_TYPE,
.do_dispose = _dispatch_lane_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_lane_invoke,
.dq_activate = _dispatch_lane_activate,
.dq_wakeup = _dispatch_lane_wakeup,
.dq_push = _dispatch_lane_concurrent_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_global, lane,
.do_type = DISPATCH_QUEUE_GLOBAL_ROOT_TYPE,
.do_dispose = _dispatch_object_no_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_object_no_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_root_queue_wakeup,
.dq_push = _dispatch_root_queue_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_cooperative, lane,
.do_type = DISPATCH_QUEUE_COOPERATIVE_ROOT_TYPE,
.do_dispose = _dispatch_object_no_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_object_no_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_root_queue_wakeup,
.dq_push = _dispatch_root_queue_push,
);
#if DISPATCH_USE_PTHREAD_ROOT_QUEUES
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_pthread_root, lane,
.do_type = DISPATCH_QUEUE_PTHREAD_ROOT_TYPE,
.do_dispose = _dispatch_pthread_root_queue_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_object_no_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_root_queue_wakeup,
.dq_push = _dispatch_root_queue_push,
);
#endif // DISPATCH_USE_PTHREAD_ROOT_QUEUES
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_mgr, lane,
.do_type = DISPATCH_QUEUE_MGR_TYPE,
.do_dispose = _dispatch_object_no_dispose,
.do_debug = _dispatch_queue_debug,
#if DISPATCH_USE_MGR_THREAD
.do_invoke = _dispatch_mgr_thread,
#else
.do_invoke = _dispatch_object_no_invoke,
#endif
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_mgr_queue_wakeup,
.dq_push = _dispatch_mgr_queue_push,
);
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_main, lane,
.do_type = DISPATCH_QUEUE_MAIN_TYPE,
.do_dispose = _dispatch_lane_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_lane_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_main_queue_wakeup,
.dq_push = _dispatch_main_queue_push,
);
#if DISPATCH_COCOA_COMPAT
DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_runloop, lane,
.do_type = DISPATCH_QUEUE_RUNLOOP_TYPE,
.do_dispose = _dispatch_runloop_queue_dispose,
.do_debug = _dispatch_queue_debug,
.do_invoke = _dispatch_lane_invoke,
.dq_activate = _dispatch_queue_no_activate,
.dq_wakeup = _dispatch_runloop_queue_wakeup,
.dq_push = _dispatch_lane_push,
);
#endif
DISPATCH_VTABLE_INSTANCE(source,
.do_type = DISPATCH_SOURCE_KEVENT_TYPE,
.do_dispose = _dispatch_source_dispose,
.do_debug = _dispatch_source_debug,
.do_invoke = _dispatch_source_invoke,
.dq_activate = _dispatch_source_activate,
.dq_wakeup = _dispatch_source_wakeup,
.dq_push = _dispatch_lane_push,
);
DISPATCH_VTABLE_INSTANCE(channel,
.do_type = DISPATCH_CHANNEL_TYPE,
.do_dispose = _dispatch_channel_dispose,
.do_debug = _dispatch_channel_debug,
.do_invoke = _dispatch_channel_invoke,
.dq_activate = _dispatch_lane_activate,
.dq_wakeup = _dispatch_channel_wakeup,
.dq_push = _dispatch_lane_push,
);
#if HAVE_MACH
DISPATCH_VTABLE_INSTANCE(mach,
.do_type = DISPATCH_MACH_CHANNEL_TYPE,
.do_dispose = _dispatch_mach_dispose,
.do_debug = _dispatch_mach_debug,
.do_invoke = _dispatch_mach_invoke,
.dq_activate = _dispatch_mach_activate,
.dq_wakeup = _dispatch_mach_wakeup,
.dq_push = _dispatch_lane_push,
);
#endif // HAVE_MACH
void
_dispatch_vtable_init(void)
{
#if OS_OBJECT_HAVE_OBJC2
// ObjC classes and dispatch vtables are co-located via linker order and
// alias files, verify correct layout during initialization rdar://10640168
dispatch_assert((char*)&DISPATCH_CONCAT(_,DISPATCH_CLASS(semaphore_vtable))
- (char*)DISPATCH_VTABLE(semaphore) ==
offsetof(struct dispatch_semaphore_vtable_s, _os_obj_vtable));
#endif // USE_OBJC
}
#pragma mark -
#pragma mark dispatch_data globals
const dispatch_block_t _dispatch_data_destructor_free = ^{
DISPATCH_INTERNAL_CRASH(0, "free destructor called");
};
const dispatch_block_t _dispatch_data_destructor_none = ^{
DISPATCH_INTERNAL_CRASH(0, "none destructor called");
};
#if !HAVE_MACH
const dispatch_block_t _dispatch_data_destructor_munmap = ^{
DISPATCH_INTERNAL_CRASH(0, "munmap destructor called");
};
#else
// _dispatch_data_destructor_munmap is a linker alias to the following
const dispatch_block_t _dispatch_data_destructor_vm_deallocate = ^{
DISPATCH_INTERNAL_CRASH(0, "vmdeallocate destructor called");
};
#endif
const dispatch_block_t _dispatch_data_destructor_inline = ^{
DISPATCH_INTERNAL_CRASH(0, "inline destructor called");
};
struct dispatch_data_s _dispatch_data_empty = {
#if DISPATCH_DATA_IS_BRIDGED_TO_NSDATA
.do_vtable = DISPATCH_DATA_EMPTY_CLASS,
#else
DISPATCH_GLOBAL_OBJECT_HEADER(data),
.do_next = DISPATCH_OBJECT_LISTLESS,
#endif
};
#pragma mark -
#pragma mark dispatch_bug
static char _dispatch_build[16];
static void
_dispatch_build_init(void *context DISPATCH_UNUSED)
{
#ifdef __APPLE__
int mib[] = { CTL_KERN, KERN_OSVERSION };
size_t bufsz = sizeof(_dispatch_build);
sysctl(mib, 2, _dispatch_build, &bufsz, NULL, 0);
#if TARGET_OS_SIMULATOR
char *sim_version = getenv("SIMULATOR_RUNTIME_BUILD_VERSION");
if (sim_version) {
(void)strlcat(_dispatch_build, " ", sizeof(_dispatch_build));
(void)strlcat(_dispatch_build, sim_version, sizeof(_dispatch_build));
}
#endif // TARGET_OS_SIMULATOR
#else
/*
* XXXRW: What to do here for !Mac OS X?
*/
memset(_dispatch_build, 0, sizeof(_dispatch_build));
#endif // __APPLE__
}
static dispatch_once_t _dispatch_build_pred;
bool
_dispatch_parse_bool(const char *v)
{
return strcasecmp(v, "YES") == 0 || strcasecmp(v, "Y") == 0 ||
strcasecmp(v, "TRUE") == 0 || atoi(v);
}
DISPATCH_NOINLINE
bool
_dispatch_getenv_bool(const char *env, bool default_v)
{
const char *v = getenv(env);
return v ? _dispatch_parse_bool(v) : default_v;
}
char*
_dispatch_get_build(void)
{
dispatch_once_f(&_dispatch_build_pred, NULL, _dispatch_build_init);
return _dispatch_build;
}
#define _dispatch_bug_log_is_repeated() ({ \
static void *last_seen; \
void *previous = last_seen; \
last_seen =__builtin_return_address(0); \
last_seen == previous; \
})
#if HAVE_OS_FAULT_WITH_PAYLOAD
__attribute__((__format__(__printf__,2,3)))
static void
_dispatch_fault(const char *reason, const char *fmt, ...)
{
char buf[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (_dispatch_mode & DISPATCH_MODE_STRICT) {
#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
} else if (!(_dispatch_mode & DISPATCH_MODE_NO_FAULTS)) {
os_fault_with_payload(OS_REASON_LIBSYSTEM,
OS_REASON_LIBSYSTEM_CODE_FAULT,
buf, (uint32_t)strlen(buf) + 1, reason, 0);
#else
(void)reason;
#endif