| /* |
| * 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 |
| |
| #pragma mark - |
| #pragma mark dispatch_init |
| |
| #if USE_LIBDISPATCH_INIT_CONSTRUCTOR |
| DISPATCH_NOTHROW __attribute__((constructor)) |
| void |
| _libdispatch_init(void); |
| |
| DISPATCH_EXPORT DISPATCH_NOTHROW |
| void |
| _libdispatch_init(void) |
| { |
| libdispatch_init(); |
| } |
| #endif |
| |
| DISPATCH_EXPORT DISPATCH_NOTHROW |
| void |
| dispatch_atfork_prepare(void) |
| { |
| _os_object_atfork_prepare(); |
| } |
| |
| DISPATCH_EXPORT DISPATCH_NOTHROW |
| void |
| dispatch_atfork_parent(void) |
| { |
| _os_object_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); |
| } |
| |
| #pragma mark - |
| #pragma mark dispatch_globals |
| |
| DISPATCH_HIDE_SYMBOL(dispatch_assert_queue, 10.12, 10.0, 10.0, 3.0); |
| DISPATCH_HIDE_SYMBOL(dispatch_assert_queue_not, 10.12, 10.0, 10.0, 3.0); |
| DISPATCH_HIDE_SYMBOL(dispatch_queue_create_with_target, 10.12, 10.0, 10.0, 3.0); |
| |
| #if DISPATCH_COCOA_COMPAT |
| void *(*_dispatch_begin_NSAutoReleasePool)(void); |
| void (*_dispatch_end_NSAutoReleasePool)(void *); |
| #endif |
| |
| #if DISPATCH_USE_THREAD_LOCAL_STORAGE |
| __thread struct dispatch_tsd __dispatch_tsd; |
| pthread_key_t __dispatch_tsd_key; |
| #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; |
| #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 |
| #if HAVE_PTHREAD_WORKQUEUE_QOS && DISPATCH_DEBUG |
| int _dispatch_set_qos_class_enabled; |
| #endif |
| #if DISPATCH_USE_KEVENT_WORKQUEUE && DISPATCH_USE_MGR_THREAD |
| int _dispatch_kevent_workqueue_enabled; |
| #endif |
| |
| DISPATCH_HW_CONFIG(); |
| uint8_t _dispatch_unsafe_fork; |
| 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 DISPATCH_USE_DIRECT_TSD |
| const struct dispatch_tsd_indexes_s dispatch_tsd_indexes = { |
| .dti_version = 2, |
| .dti_queue_index = dispatch_queue_key, |
| .dti_voucher_index = dispatch_voucher_key, |
| .dti_qos_class_index = dispatch_priority_key, |
| }; |
| #endif // DISPATCH_USE_DIRECT_TSD |
| |
| // 6618342 Contact the team that owns the Instrument DTrace probe before |
| // renaming this symbol |
| DISPATCH_CACHELINE_ALIGN |
| struct dispatch_queue_s _dispatch_main_q = { |
| DISPATCH_GLOBAL_OBJECT_HEADER(queue_main), |
| #if !DISPATCH_USE_RESOLVERS |
| .do_targetq = &_dispatch_root_queues[ |
| DISPATCH_ROOT_QUEUE_IDX_DEFAULT_QOS_OVERCOMMIT], |
| #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_CANNOT_TRYSYNC | DQF_WIDTH(1), |
| .dq_serialnum = 1, |
| }; |
| |
| #pragma mark - |
| #pragma mark dispatch_queue_attr_t |
| |
| #define DISPATCH_QUEUE_ATTR_INIT(qos, prio, overcommit, freq, concurrent, \ |
| inactive) \ |
| { \ |
| DISPATCH_GLOBAL_OBJECT_HEADER(queue_attr), \ |
| .dqa_qos_and_relpri = (_dispatch_priority_make(qos, prio) & \ |
| DISPATCH_PRIORITY_REQUESTED_MASK), \ |
| .dqa_overcommit = _dispatch_queue_attr_overcommit_##overcommit, \ |
| .dqa_autorelease_frequency = DISPATCH_AUTORELEASE_FREQUENCY_##freq, \ |
| .dqa_concurrent = (concurrent), \ |
| .dqa_inactive = (inactive), \ |
| } |
| |
| #define DISPATCH_QUEUE_ATTR_ACTIVE_INIT(qos, prio, overcommit, freq, \ |
| concurrent) \ |
| { \ |
| [DQA_INDEX_ACTIVE] = DISPATCH_QUEUE_ATTR_INIT( \ |
| qos, prio, overcommit, freq, concurrent, false), \ |
| [DQA_INDEX_INACTIVE] = DISPATCH_QUEUE_ATTR_INIT( \ |
| qos, prio, overcommit, freq, concurrent, true), \ |
| } |
| |
| #define DISPATCH_QUEUE_ATTR_OVERCOMMIT_INIT(qos, prio, overcommit) \ |
| { \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_INHERIT][DQA_INDEX_CONCURRENT] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT( \ |
| qos, prio, overcommit, INHERIT, 1), \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_INHERIT][DQA_INDEX_SERIAL] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT( \ |
| qos, prio, overcommit, INHERIT, 0), \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_WORK_ITEM][DQA_INDEX_CONCURRENT] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT( \ |
| qos, prio, overcommit, WORK_ITEM, 1), \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_WORK_ITEM][DQA_INDEX_SERIAL] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT( \ |
| qos, prio, overcommit, WORK_ITEM, 0), \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_NEVER][DQA_INDEX_CONCURRENT] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT( \ |
| qos, prio, overcommit, NEVER, 1), \ |
| [DQA_INDEX_AUTORELEASE_FREQUENCY_NEVER][DQA_INDEX_SERIAL] = \ |
| DISPATCH_QUEUE_ATTR_ACTIVE_INIT(\ |
| qos, prio, overcommit, NEVER, 0), \ |
| } |
| |
| #define DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, prio) \ |
| [prio] = { \ |
| [DQA_INDEX_UNSPECIFIED_OVERCOMMIT] = \ |
| DISPATCH_QUEUE_ATTR_OVERCOMMIT_INIT(qos, -(prio), unspecified),\ |
| [DQA_INDEX_NON_OVERCOMMIT] = \ |
| DISPATCH_QUEUE_ATTR_OVERCOMMIT_INIT(qos, -(prio), disabled), \ |
| [DQA_INDEX_OVERCOMMIT] = \ |
| DISPATCH_QUEUE_ATTR_OVERCOMMIT_INIT(qos, -(prio), enabled), \ |
| } |
| |
| #define DISPATCH_QUEUE_ATTR_PRIO_INIT(qos) \ |
| { \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 0), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 1), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 2), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 3), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 4), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 5), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 6), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 7), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 8), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 9), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 10), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 11), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 12), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 13), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 14), \ |
| DISPATCH_QUEUE_ATTR_PRIO_INITIALIZER(qos, 15), \ |
| } |
| |
| #define DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(qos) \ |
| [DQA_INDEX_QOS_CLASS_##qos] = \ |
| DISPATCH_QUEUE_ATTR_PRIO_INIT(DISPATCH_QOS_##qos) |
| |
| // DISPATCH_QUEUE_CONCURRENT resp. _dispatch_queue_attr_concurrent is aliased |
| // to array member [0][0][0][0][0][0] and their properties must match! |
| const struct dispatch_queue_attr_s _dispatch_queue_attrs[] |
| [DISPATCH_QUEUE_ATTR_PRIO_COUNT] |
| [DISPATCH_QUEUE_ATTR_OVERCOMMIT_COUNT] |
| [DISPATCH_QUEUE_ATTR_AUTORELEASE_FREQUENCY_COUNT] |
| [DISPATCH_QUEUE_ATTR_CONCURRENCY_COUNT] |
| [DISPATCH_QUEUE_ATTR_INACTIVE_COUNT] = { |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(UNSPECIFIED), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(MAINTENANCE), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(BACKGROUND), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(UTILITY), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(DEFAULT), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(USER_INITIATED), |
| DISPATCH_QUEUE_ATTR_QOS_INITIALIZER(USER_INTERACTIVE), |
| }; |
| |
| #if DISPATCH_VARIANT_STATIC |
| // <rdar://problem/16778703> |
| struct dispatch_queue_attr_s _dispatch_queue_attr_concurrent = |
| DISPATCH_QUEUE_ATTR_INIT(QOS_CLASS_UNSPECIFIED, 0, |
| unspecified, INHERIT, 1, false); |
| #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 |
| |
| #pragma mark - |
| #pragma mark dispatch_vtables |
| |
| DISPATCH_VTABLE_INSTANCE(semaphore, |
| .do_type = DISPATCH_SEMAPHORE_TYPE, |
| .do_kind = "semaphore", |
| .do_dispose = _dispatch_semaphore_dispose, |
| .do_debug = _dispatch_semaphore_debug, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(group, |
| .do_type = DISPATCH_GROUP_TYPE, |
| .do_kind = "group", |
| .do_dispose = _dispatch_group_dispose, |
| .do_debug = _dispatch_group_debug, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(queue, |
| .do_type = DISPATCH_QUEUE_LEGACY_TYPE, |
| .do_kind = "queue", |
| .do_dispose = _dispatch_queue_dispose, |
| .do_suspend = _dispatch_queue_suspend, |
| .do_resume = _dispatch_queue_resume, |
| .do_push = _dispatch_queue_push, |
| .do_invoke = _dispatch_queue_invoke, |
| .do_wakeup = _dispatch_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| .do_set_targetq = _dispatch_queue_set_target_queue, |
| ); |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_serial, queue, |
| .do_type = DISPATCH_QUEUE_SERIAL_TYPE, |
| .do_kind = "serial-queue", |
| .do_dispose = _dispatch_queue_dispose, |
| .do_suspend = _dispatch_queue_suspend, |
| .do_resume = _dispatch_queue_resume, |
| .do_finalize_activation = _dispatch_queue_finalize_activation, |
| .do_push = _dispatch_queue_push, |
| .do_invoke = _dispatch_queue_invoke, |
| .do_wakeup = _dispatch_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| .do_set_targetq = _dispatch_queue_set_target_queue, |
| ); |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_concurrent, queue, |
| .do_type = DISPATCH_QUEUE_CONCURRENT_TYPE, |
| .do_kind = "concurrent-queue", |
| .do_dispose = _dispatch_queue_dispose, |
| .do_suspend = _dispatch_queue_suspend, |
| .do_resume = _dispatch_queue_resume, |
| .do_finalize_activation = _dispatch_queue_finalize_activation, |
| .do_push = _dispatch_queue_push, |
| .do_invoke = _dispatch_queue_invoke, |
| .do_wakeup = _dispatch_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| .do_set_targetq = _dispatch_queue_set_target_queue, |
| ); |
| |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_root, queue, |
| .do_type = DISPATCH_QUEUE_GLOBAL_ROOT_TYPE, |
| .do_kind = "global-queue", |
| .do_dispose = _dispatch_pthread_root_queue_dispose, |
| .do_push = _dispatch_root_queue_push, |
| .do_invoke = NULL, |
| .do_wakeup = _dispatch_root_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| ); |
| |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_main, queue, |
| .do_type = DISPATCH_QUEUE_SERIAL_TYPE, |
| .do_kind = "main-queue", |
| .do_dispose = _dispatch_queue_dispose, |
| .do_push = _dispatch_queue_push, |
| .do_invoke = _dispatch_queue_invoke, |
| .do_wakeup = _dispatch_main_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| ); |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_runloop, queue, |
| .do_type = DISPATCH_QUEUE_RUNLOOP_TYPE, |
| .do_kind = "runloop-queue", |
| .do_dispose = _dispatch_runloop_queue_dispose, |
| .do_push = _dispatch_queue_push, |
| .do_invoke = _dispatch_queue_invoke, |
| .do_wakeup = _dispatch_runloop_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| ); |
| |
| DISPATCH_VTABLE_SUBCLASS_INSTANCE(queue_mgr, queue, |
| .do_type = DISPATCH_QUEUE_MGR_TYPE, |
| .do_kind = "mgr-queue", |
| .do_push = _dispatch_mgr_queue_push, |
| .do_invoke = _dispatch_mgr_thread, |
| .do_wakeup = _dispatch_mgr_queue_wakeup, |
| .do_debug = dispatch_queue_debug, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(queue_specific_queue, |
| .do_type = DISPATCH_QUEUE_SPECIFIC_TYPE, |
| .do_kind = "queue-context", |
| .do_dispose = _dispatch_queue_specific_queue_dispose, |
| .do_push = (void *)_dispatch_queue_push, |
| .do_invoke = (void *)_dispatch_queue_invoke, |
| .do_wakeup = (void *)_dispatch_queue_wakeup, |
| .do_debug = (void *)dispatch_queue_debug, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(queue_attr, |
| .do_type = DISPATCH_QUEUE_ATTR_TYPE, |
| .do_kind = "queue-attr", |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(source, |
| .do_type = DISPATCH_SOURCE_KEVENT_TYPE, |
| .do_kind = "kevent-source", |
| .do_dispose = _dispatch_source_dispose, |
| .do_suspend = (void *)_dispatch_queue_suspend, |
| .do_resume = (void *)_dispatch_queue_resume, |
| .do_finalize_activation = _dispatch_source_finalize_activation, |
| .do_push = (void *)_dispatch_queue_push, |
| .do_invoke = _dispatch_source_invoke, |
| .do_wakeup = _dispatch_source_wakeup, |
| .do_debug = _dispatch_source_debug, |
| .do_set_targetq = (void *)_dispatch_queue_set_target_queue, |
| ); |
| |
| #if HAVE_MACH |
| DISPATCH_VTABLE_INSTANCE(mach, |
| .do_type = DISPATCH_MACH_CHANNEL_TYPE, |
| .do_kind = "mach-channel", |
| .do_dispose = _dispatch_mach_dispose, |
| .do_suspend = (void *)_dispatch_queue_suspend, |
| .do_resume = (void *)_dispatch_queue_resume, |
| .do_finalize_activation = _dispatch_mach_finalize_activation, |
| .do_push = (void *)_dispatch_queue_push, |
| .do_invoke = _dispatch_mach_invoke, |
| .do_wakeup = _dispatch_mach_wakeup, |
| .do_debug = _dispatch_mach_debug, |
| .do_set_targetq = (void *)_dispatch_queue_set_target_queue, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(mach_msg, |
| .do_type = DISPATCH_MACH_MSG_TYPE, |
| .do_kind = "mach-msg", |
| .do_dispose = _dispatch_mach_msg_dispose, |
| .do_invoke = _dispatch_mach_msg_invoke, |
| .do_debug = _dispatch_mach_msg_debug, |
| ); |
| #endif // HAVE_MACH |
| |
| #if !DISPATCH_DATA_IS_BRIDGED_TO_NSDATA |
| DISPATCH_VTABLE_INSTANCE(data, |
| .do_type = DISPATCH_DATA_TYPE, |
| .do_kind = "data", |
| .do_dispose = _dispatch_data_dispose, |
| .do_debug = _dispatch_data_debug, |
| .do_set_targetq = (void*)_dispatch_data_set_target_queue, |
| ); |
| #endif |
| |
| DISPATCH_VTABLE_INSTANCE(io, |
| .do_type = DISPATCH_IO_TYPE, |
| .do_kind = "channel", |
| .do_dispose = _dispatch_io_dispose, |
| .do_debug = _dispatch_io_debug, |
| .do_set_targetq = _dispatch_io_set_target_queue, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(operation, |
| .do_type = DISPATCH_OPERATION_TYPE, |
| .do_kind = "operation", |
| .do_dispose = _dispatch_operation_dispose, |
| .do_debug = _dispatch_operation_debug, |
| ); |
| |
| DISPATCH_VTABLE_INSTANCE(disk, |
| .do_type = DISPATCH_DISK_TYPE, |
| .do_kind = "disk", |
| .do_dispose = _dispatch_disk_dispose, |
| ); |
| |
| |
| 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_IPHONE_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_IPHONE_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; |
| |
| char* |
| _dispatch_get_build(void) |
| { |
| dispatch_once_f(&_dispatch_build_pred, NULL, _dispatch_build_init); |
| return _dispatch_build; |
| } |
| |
| #define _dispatch_bug_log(msg, ...) do { \ |
| static void *last_seen; \ |
| void *ra = __builtin_return_address(0); \ |
| if (last_seen != ra) { \ |
| last_seen = ra; \ |
| _dispatch_log(msg, ##__VA_ARGS__); \ |
| } \ |
| } while(0) |
| |
| void |
| _dispatch_bug(size_t line, long val) |
| { |
| dispatch_once_f(&_dispatch_build_pred, NULL, _dispatch_build_init); |
| _dispatch_bug_log("BUG in libdispatch: %s - %lu - 0x%lx", |
| _dispatch_build, (unsigned long)line, val); |
| } |
| |
| void |
| _dispatch_bug_client(const char* msg) |
| { |
| _dispatch_bug_log("BUG in libdispatch client: %s", msg); |
| } |
| |
| #if HAVE_MACH |
| void |
| _dispatch_bug_mach_client(const char* msg, mach_msg_return_t kr) |
| { |
| _dispatch_bug_log("BUG in libdispatch client: %s %s - 0x%x", msg, |
| mach_error_string(kr), kr); |
| } |
| #endif |
| |
| void |
| _dispatch_bug_kevent_client(const char* msg, const char* filter, |
| const char *operation, int err) |
| { |
| if (operation && err) { |
| _dispatch_bug_log("BUG in libdispatch client: %s[%s] %s: \"%s\" - 0x%x", |
| msg, filter, operation, strerror(err), err); |
| } else if (operation) { |
| _dispatch_bug_log("BUG in libdispatch client: %s[%s] %s", |
| msg, filter, operation); |
| } else { |
| _dispatch_bug_log("BUG in libdispatch: %s[%s]: \"%s\" - 0x%x", |
| msg, filter, strerror(err), err); |
| } |
| } |
| |
| void |
| _dispatch_bug_deprecated(const char *msg) |
| { |
| _dispatch_bug_log("DEPRECATED USE in libdispatch client: %s", msg); |
| } |
| |
| void |
| _dispatch_abort(size_t line, long val) |
| { |
| _dispatch_bug(line, val); |
| abort(); |
| } |
| |
| #if !DISPATCH_USE_OS_DEBUG_LOG |
| |
| #pragma mark - |
| #pragma mark dispatch_log |
| |
| static int dispatch_logfile = -1; |
| static bool dispatch_log_disabled; |
| #if DISPATCH_DEBUG |
| static uint64_t dispatch_log_basetime; |
| #endif |
| static dispatch_once_t _dispatch_logv_pred; |
| |
| static void |
| _dispatch_logv_init(void *context DISPATCH_UNUSED) |
| { |
| #if DISPATCH_DEBUG |
| bool log_to_file = true; |
| #else |
| bool log_to_file = false; |
| #endif |
| char *e = getenv("LIBDISPATCH_LOG"); |
| if (e) { |
| if (strcmp(e, "YES") == 0) { |
| // default |
| } else if (strcmp(e, "NO") == 0) { |
| dispatch_log_disabled = true; |
| } else if (strcmp(e, "syslog") == 0) { |
| log_to_file = false; |
| } else if (strcmp(e, "file") == 0) { |
| log_to_file = true; |
| } else if (strcmp(e, "stderr") == 0) { |
| log_to_file = true; |
| dispatch_logfile = STDERR_FILENO; |
| } |
| } |
| if (!dispatch_log_disabled) { |
| if (log_to_file && dispatch_logfile == -1) { |
| char path[PATH_MAX]; |
| snprintf(path, sizeof(path), "/var/tmp/libdispatch.%d.log", |
| getpid()); |
| dispatch_logfile = open(path, O_WRONLY | O_APPEND | O_CREAT | |
| O_NOFOLLOW | O_CLOEXEC, 0666); |
| } |
| if (dispatch_logfile != -1) { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| #if DISPATCH_DEBUG |
| dispatch_log_basetime = _dispatch_absolute_time(); |
| #endif |
| dprintf(dispatch_logfile, "=== log file opened for %s[%u] at " |
| "%ld.%06u ===\n", getprogname() ?: "", getpid(), |
| tv.tv_sec, (int)tv.tv_usec); |
| } |
| } |
| } |
| |
| static inline void |
| _dispatch_log_file(char *buf, size_t len) |
| { |
| ssize_t r; |
| |
| buf[len++] = '\n'; |
| retry: |
| r = write(dispatch_logfile, buf, len); |
| if (slowpath(r == -1) && errno == EINTR) { |
| goto retry; |
| } |
| } |
| |
| DISPATCH_NOINLINE |
| static void |
| _dispatch_logv_file(const char *msg, va_list ap) |
| { |
| char buf[2048]; |
| size_t bufsiz = sizeof(buf), offset = 0; |
| int r; |
| |
| #if DISPATCH_DEBUG |
| offset += dsnprintf(&buf[offset], bufsiz - offset, "%llu\t", |
| (unsigned long long)_dispatch_absolute_time() - dispatch_log_basetime); |
| #endif |
| r = vsnprintf(&buf[offset], bufsiz - offset, msg, ap); |
| if (r < 0) return; |
| offset += (size_t)r; |
| if (offset > bufsiz - 1) { |
| offset = bufsiz - 1; |
| } |
| _dispatch_log_file(buf, offset); |
| } |
| |
| #if DISPATCH_USE_SIMPLE_ASL |
| static inline void |
| _dispatch_syslog(const char *msg) |
| { |
| _simple_asl_log(ASL_LEVEL_NOTICE, "com.apple.libsystem.libdispatch", msg); |
| } |
| |
| static inline void |
| _dispatch_vsyslog(const char *msg, va_list ap) |
| { |
| char *str; |
| vasprintf(&str, msg, ap); |
| if (str) { |
| _dispatch_syslog(str); |
| free(str); |
| } |
| } |
| #else // DISPATCH_USE_SIMPLE_ASL |
| static inline void |
| _dispatch_syslog(const char *msg) |
| { |
| syslog(LOG_NOTICE, "%s", msg); |
| } |
| |
| static inline void |
| _dispatch_vsyslog(const char *msg, va_list ap) |
| { |
| vsyslog(LOG_NOTICE, msg, ap); |
| } |
| #endif // DISPATCH_USE_SIMPLE_ASL |
| |
| DISPATCH_ALWAYS_INLINE |
| static inline void |
| _dispatch_logv(const char *msg, size_t len, va_list *ap_ptr) |
| { |
| dispatch_once_f(&_dispatch_logv_pred, NULL, _dispatch_logv_init); |
| if (slowpath(dispatch_log_disabled)) { |
| return; |
| } |
| if (slowpath(dispatch_logfile != -1)) { |
| if (!ap_ptr) { |
| return _dispatch_log_file((char*)msg, len); |
| } |
| return _dispatch_logv_file(msg, *ap_ptr); |
| } |
| if (!ap_ptr) { |
| return _dispatch_syslog(msg); |
| } |
| return _dispatch_vsyslog(msg, *ap_ptr); |
| } |
| |
| DISPATCH_NOINLINE |
| void |
| _dispatch_log(const char *msg, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, msg); |
| _dispatch_logv(msg, 0, &ap); |
| va_end(ap); |
| } |
| |
| #endif // DISPATCH_USE_OS_DEBUG_LOG |
| |
| #pragma mark - |
| #pragma mark dispatch_debug |
| |
| static size_t |
| _dispatch_object_debug2(dispatch_object_t dou, char* buf, size_t bufsiz) |
| { |
| DISPATCH_OBJECT_TFB(_dispatch_objc_debug, dou, buf, bufsiz); |
| if (dx_vtable(dou._do)->do_debug) { |
| return dx_debug(dou._do, buf, bufsiz); |
| } |
| return strlcpy(buf, "NULL vtable slot: ", bufsiz); |
| } |
| |
| DISPATCH_NOINLINE |
| static void |
| _dispatch_debugv(dispatch_object_t dou, const char *msg, va_list ap) |
| { |
| char buf[2048]; |
| size_t bufsiz = sizeof(buf), offset = 0; |
| int r; |
| #if DISPATCH_DEBUG && !DISPATCH_USE_OS_DEBUG_LOG |
| offset += dsnprintf(&buf[offset], bufsiz - offset, "%llu\t\t%p\t", |
| (unsigned long long)_dispatch_absolute_time() - dispatch_log_basetime, |
| (void *)_dispatch_thread_self()); |
| #endif |
| if (dou._do) { |
| offset += _dispatch_object_debug2(dou, &buf[offset], bufsiz - offset); |
| dispatch_assert(offset + 2 < bufsiz); |
| buf[offset++] = ':'; |
| buf[offset++] = ' '; |
| buf[offset] = '\0'; |
| } else { |
| offset += strlcpy(&buf[offset], "NULL: ", bufsiz - offset); |
| } |
| r = vsnprintf(&buf[offset], bufsiz - offset, msg, ap); |
| #if !DISPATCH_USE_OS_DEBUG_LOG |
| size_t len = offset + (r < 0 ? 0 : (size_t)r); |
| if (len > bufsiz - 1) { |
| len = bufsiz - 1; |
| } |
| _dispatch_logv(buf, len, NULL); |
| #else |
| _dispatch_log("%s", buf); |
| #endif |
| } |
| |
| DISPATCH_NOINLINE |
| void |
| dispatch_debugv(dispatch_object_t dou, const char *msg, va_list ap) |
| { |
| _dispatch_debugv(dou, msg, ap); |
| } |
| |
| DISPATCH_NOINLINE |
| void |
| dispatch_debug(dispatch_object_t dou, const char *msg, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, msg); |
| _dispatch_debugv(dou, msg, ap); |
| va_end(ap); |
| } |
| |
| #if DISPATCH_DEBUG |
| DISPATCH_NOINLINE |
| void |
| _dispatch_object_debug(dispatch_object_t dou, const char *msg, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, msg); |
| _dispatch_debugv(dou._do, msg, ap); |
| va_end(ap); |
| } |
| #endif |
| |
| #pragma mark - |
| #pragma mark dispatch_calloc |
| |
| DISPATCH_NOINLINE |
| void |
| _dispatch_temporary_resource_shortage(void) |
| { |
| sleep(1); |
| __asm__ __volatile__(""); // prevent tailcall |
| } |
| |
| void * |
| _dispatch_calloc(size_t num_items, size_t size) |
| { |
| void *buf; |
| while (!fastpath(buf = calloc(num_items, size))) { |
| _dispatch_temporary_resource_shortage(); |
| } |
| return buf; |
| } |
| |
| /** |
| * If the source string is mutable, allocates memory and copies the contents. |
| * Otherwise returns the source string. |
| */ |
| const char * |
| _dispatch_strdup_if_mutable(const char *str) |
| { |
| #if HAVE_DYLD_IS_MEMORY_IMMUTABLE |
| size_t size = strlen(str) + 1; |
| if (slowpath(!_dyld_is_memory_immutable(str, size))) { |
| char *clone = (char *) malloc(size); |
| if (dispatch_assume(clone)) { |
| memcpy(clone, str, size); |
| } |
| return clone; |
| } |
| return str; |
| #else |
| return strdup(str); |
| #endif |
| } |
| |
| #pragma mark - |
| #pragma mark dispatch_block_t |
| |
| #ifdef __BLOCKS__ |
| |
| void * |
| (_dispatch_Block_copy)(void *db) |
| { |
| dispatch_block_t rval; |
| |
| if (fastpath(db)) { |
| while (!fastpath(rval = Block_copy(db))) { |
| _dispatch_temporary_resource_shortage(); |
| } |
| return rval; |
| } |
| DISPATCH_CLIENT_CRASH(0, "NULL was passed where a block should have been"); |
| } |
| |
| void |
| _dispatch_call_block_and_release(void *block) |
| { |
| void (^b)(void) = block; |
| b(); |
| Block_release(b); |
| } |
| |
| #endif // __BLOCKS__ |
| |
| #pragma mark - |
| #pragma mark dispatch_client_callout |
| |
| // Abort on uncaught exceptions thrown from client callouts rdar://8577499 |
| #if DISPATCH_USE_CLIENT_CALLOUT && (__USING_SJLJ_EXCEPTIONS__ || !USE_OBJC || \ |
| OS_OBJECT_HAVE_OBJC1) |
| // On platforms with SjLj exceptions, avoid the SjLj overhead on every callout |
| // by clearing the unwinder's TSD pointer to the handler stack around callouts |
| |
| #define _dispatch_get_tsd_base() |
| #define _dispatch_get_unwind_tsd() (NULL) |
| #define _dispatch_set_unwind_tsd(u) do {(void)(u);} while (0) |
| #define _dispatch_free_unwind_tsd() |
| |
| #undef _dispatch_client_callout |
| DISPATCH_NOINLINE |
| void |
| _dispatch_client_callout(void *ctxt, dispatch_function_t f) |
| { |
| _dispatch_get_tsd_base(); |
| void *u = _dispatch_get_unwind_tsd(); |
| if (fastpath(!u)) return f(ctxt); |
| _dispatch_set_unwind_tsd(NULL); |
| f(ctxt); |
| _dispatch_free_unwind_tsd(); |
| _dispatch_set_unwind_tsd(u); |
| } |
| |
| #undef _dispatch_client_callout2 |
| DISPATCH_NOINLINE |
| void |
| _dispatch_client_callout2(void *ctxt, size_t i, void (*f)(void *, size_t)) |
| { |
| _dispatch_get_tsd_base(); |
| void *u = _dispatch_get_unwind_tsd(); |
| if (fastpath(!u)) return f(ctxt, i); |
| _dispatch_set_unwind_tsd(NULL); |
| f(ctxt, i); |
| _dispatch_free_unwind_tsd(); |
| _dispatch_set_unwind_tsd(u); |
| } |
| |
| #if HAVE_MACH |
| |
| #undef _dispatch_client_callout3 |
| DISPATCH_NOINLINE |
| void |
| _dispatch_client_callout3(void *ctxt, dispatch_mach_reason_t reason, |
| dispatch_mach_msg_t dmsg, dispatch_mach_async_reply_callback_t f) |
| { |
| _dispatch_get_tsd_base(); |
| void *u = _dispatch_get_unwind_tsd(); |
| if (fastpath(!u)) return f(ctxt, reason, dmsg); |
| _dispatch_set_unwind_tsd(NULL); |
| f(ctxt, reason, dmsg); |
| _dispatch_free_unwind_tsd(); |
| _dispatch_set_unwind_tsd(u); |
| } |
| |
| #undef _dispatch_client_callout4 |
| void |
| _dispatch_client_callout4(void *ctxt, dispatch_mach_reason_t reason, |
| dispatch_mach_msg_t dmsg, mach_error_t error, |
| dispatch_mach_handler_function_t f) |
| { |
| _dispatch_get_tsd_base(); |
| void *u = _dispatch_get_unwind_tsd(); |
| if (fastpath(!u)) return f(ctxt, reason, dmsg, error); |
| _dispatch_set_unwind_tsd(NULL); |
| f(ctxt, reason, dmsg, error); |
| _dispatch_free_unwind_tsd(); |
| _dispatch_set_unwind_tsd(u); |
| } |
| #endif // HAVE_MACH |
| |
| #endif // DISPATCH_USE_CLIENT_CALLOUT |
| |
| #pragma mark - |
| #pragma mark _os_object_t no_objc |
| |
| #if !USE_OBJC |
| |
| static const _os_object_vtable_s _os_object_vtable; |
| |
| void |
| _os_object_init(void) |
| { |
| return; |
| } |
| |
| inline _os_object_t |
| _os_object_alloc_realized(const void *cls, size_t size) |
| { |
| _os_object_t obj; |
| dispatch_assert(size >= sizeof(struct _os_object_s)); |
| while (!fastpath(obj = calloc(1u, size))) { |
| _dispatch_temporary_resource_shortage(); |
| } |
| obj->os_obj_isa = cls; |
| return obj; |
| } |
| |
| _os_object_t |
| _os_object_alloc(const void *cls, size_t size) |
| { |
| if (!cls) cls = &_os_object_vtable; |
| return _os_object_alloc_realized(cls, size); |
| } |
| |
| void |
| _os_object_dealloc(_os_object_t obj) |
| { |
| *((void *volatile*)&obj->os_obj_isa) = (void *)0x200; |
| return free(obj); |
| } |
| |
| void |
| _os_object_xref_dispose(_os_object_t obj) |
| { |
| _os_object_xrefcnt_dispose_barrier(obj); |
| if (fastpath(obj->os_obj_isa->_os_obj_xref_dispose)) { |
| return obj->os_obj_isa->_os_obj_xref_dispose(obj); |
| } |
| return _os_object_release_internal(obj); |
| } |
| |
| void |
| _os_object_dispose(_os_object_t obj) |
| { |
| _os_object_refcnt_dispose_barrier(obj); |
| if (fastpath(obj->os_obj_isa->_os_obj_dispose)) { |
| return obj->os_obj_isa->_os_obj_dispose(obj); |
| } |
| return _os_object_dealloc(obj); |
| } |
| |
| void* |
| os_retain(void *obj) |
| { |
| if (fastpath(obj)) { |
| return _os_object_retain(obj); |
| } |
| return obj; |
| } |
| |
| #undef os_release |
| void |
| os_release(void *obj) |
| { |
| if (fastpath(obj)) { |
| return _os_object_release(obj); |
| } |
| } |
| |
| void |
| _os_object_atfork_prepare(void) |
| { |
| return; |
| } |
| |
| void |
| _os_object_atfork_parent(void) |
| { |
| return; |
| } |
| |
| void |
| _os_object_atfork_child(void) |
| { |
| return; |
| } |
| |
| #pragma mark - |
| #pragma mark dispatch_autorelease_pool no_objc |
| |
| #if DISPATCH_COCOA_COMPAT |
| |
| void* |
| _dispatch_autorelease_pool_push(void) |
| { |
| void *pool = NULL; |
| if (_dispatch_begin_NSAutoReleasePool) { |
| pool = _dispatch_begin_NSAutoReleasePool(); |
| } |
| return pool; |
| } |
| |
| void |
| _dispatch_autorelease_pool_pop(void *pool) |
| { |
| if (_dispatch_end_NSAutoReleasePool) { |
| _dispatch_end_NSAutoReleasePool(pool); |
| } |
| } |
| |
| void |
| _dispatch_last_resort_autorelease_pool_push(dispatch_invoke_context_t dic) |
| { |
| dic->dic_autorelease_pool = _dispatch_autorelease_pool_push(); |
| } |
| |
| void |
| _dispatch_last_resort_autorelease_pool_pop(dispatch_invoke_context_t dic) |
| { |
| _dispatch_autorelease_pool_pop(dic->dic_autorelease_pool); |
| dic->dic_autorelease_pool = NULL; |
| } |
| |
| #endif // DISPATCH_COCOA_COMPAT |
| #endif // !USE_OBJC |
| |
| #pragma mark - |
| #pragma mark dispatch_mig |
| #if HAVE_MACH |
| |
| void * |
| dispatch_mach_msg_get_context(mach_msg_header_t *msg) |
| { |
| mach_msg_context_trailer_t *tp; |
| void *context = NULL; |
| |
| tp = (mach_msg_context_trailer_t *)((uint8_t *)msg + |
| round_msg(msg->msgh_size)); |
| if (tp->msgh_trailer_size >= |
| (mach_msg_size_t)sizeof(mach_msg_context_trailer_t)) { |
| context = (void *)(uintptr_t)tp->msgh_context; |
| } |
| return context; |
| } |
| |
| kern_return_t |
| _dispatch_wakeup_runloop_thread(mach_port_t mp DISPATCH_UNUSED) |
| { |
| // dummy function just to pop a runloop thread out of mach_msg() |
| return 0; |
| } |
| |
| kern_return_t |
| _dispatch_consume_send_once_right(mach_port_t mp DISPATCH_UNUSED) |
| { |
| // dummy function to consume a send-once right |
| return 0; |
| } |
| |
| kern_return_t |
| _dispatch_mach_notify_port_destroyed(mach_port_t notify DISPATCH_UNUSED, |
| mach_port_t name) |
| { |
| DISPATCH_INTERNAL_CRASH(name, "unexpected receipt of port-destroyed"); |
| return KERN_FAILURE; |
| } |
| |
| kern_return_t |
| _dispatch_mach_notify_no_senders(mach_port_t notify DISPATCH_UNUSED, |
| mach_port_mscount_t mscnt) |
| { |
| DISPATCH_INTERNAL_CRASH(mscnt, "unexpected receipt of no-more-senders"); |
| return KERN_FAILURE; |
| } |
| |
| kern_return_t |
| _dispatch_mach_notify_send_once(mach_port_t notify DISPATCH_UNUSED) |
| { |
| // we only register for dead-name notifications |
| // some code deallocated our send-once right without consuming it |
| #if DISPATCH_DEBUG |
| _dispatch_log("Corruption: An app/library deleted a libdispatch " |
| "dead-name notification"); |
| #endif |
| return KERN_SUCCESS; |
| } |
| |
| #endif // HAVE_MACH |