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CFRunLoop.c
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CFRunLoop.c
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/*
* Copyright (c) 2014 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/* CFRunLoop.c
Copyright (c) 1998-2013, Apple Inc. All rights reserved.
Responsibility: Tony Parker
*/
#include <CoreFoundation/CFRunLoop.h>
#include <CoreFoundation/CFSet.h>
#include <CoreFoundation/CFBag.h>
#include <CoreFoundation/CFNumber.h>
#include <CoreFoundation/CFPreferences.h>
#include "CFInternal.h"
#include <math.h>
#include <stdio.h>
#include <limits.h>
#include <pthread.h>
#include <dispatch/dispatch.h>
#if DEPLOYMENT_TARGET_WINDOWS
#include <typeinfo.h>
#endif
#include <checkint.h>
#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI
#include <sys/param.h>
#include <dispatch/private.h>
#include <CoreFoundation/CFUserNotification.h>
#include <mach/mach.h>
#include <mach/clock_types.h>
#include <mach/clock.h>
#include <unistd.h>
#include <dlfcn.h>
#include <pthread/private.h>
extern mach_port_t _dispatch_get_main_queue_port_4CF(void);
extern void _dispatch_main_queue_callback_4CF(mach_msg_header_t *msg);
#elif DEPLOYMENT_TARGET_WINDOWS
#include <process.h>
DISPATCH_EXPORT HANDLE _dispatch_get_main_queue_handle_4CF(void);
DISPATCH_EXPORT void _dispatch_main_queue_callback_4CF(void);
#define MACH_PORT_NULL 0
#define mach_port_name_t HANDLE
#define mach_port_t HANDLE
#define _dispatch_get_main_queue_port_4CF _dispatch_get_main_queue_handle_4CF
#define _dispatch_main_queue_callback_4CF(x) _dispatch_main_queue_callback_4CF()
#define AbsoluteTime LARGE_INTEGER
#endif
#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_IPHONESIMULATOR
CF_EXPORT pthread_t _CF_pthread_main_thread_np(void);
#define pthread_main_thread_np() _CF_pthread_main_thread_np()
#endif
#include <Block.h>
#include <Block_private.h>
#if DEPLOYMENT_TARGET_MACOSX
#define USE_DISPATCH_SOURCE_FOR_TIMERS 1
#define USE_MK_TIMER_TOO 1
#else
#define USE_DISPATCH_SOURCE_FOR_TIMERS 0
#define USE_MK_TIMER_TOO 1
#endif
static int _LogCFRunLoop = 0;
static void _runLoopTimerWithBlockContext(CFRunLoopTimerRef timer, void *opaqueBlock);
// for conservative arithmetic safety, such that (TIMER_DATE_LIMIT + TIMER_INTERVAL_LIMIT + kCFAbsoluteTimeIntervalSince1970) * 10^9 < 2^63
#define TIMER_DATE_LIMIT 4039289856.0
#define TIMER_INTERVAL_LIMIT 504911232.0
#define HANDLE_DISPATCH_ON_BASE_INVOCATION_ONLY 0
#define CRASH(string, errcode) do { char msg[256]; snprintf(msg, 256, string, errcode); CRSetCrashLogMessage(msg); HALT; } while (0)
#if DEPLOYMENT_TARGET_WINDOWS
static pthread_t kNilPthreadT = { nil, nil };
#define pthreadPointer(a) a.p
typedef int kern_return_t;
#define KERN_SUCCESS 0
#else
static pthread_t kNilPthreadT = (pthread_t)0;
#define pthreadPointer(a) a
#define lockCount(a) a
#endif
#pragma mark -
#define CF_RUN_LOOP_PROBES 0
#if CF_RUN_LOOP_PROBES
#include "CFRunLoopProbes.h"
#else
#define CFRUNLOOP_NEXT_TIMER_ARMED(arg0) do { } while (0)
#define CFRUNLOOP_NEXT_TIMER_ARMED_ENABLED() (0)
#define CFRUNLOOP_POLL() do { } while (0)
#define CFRUNLOOP_POLL_ENABLED() (0)
#define CFRUNLOOP_SLEEP() do { } while (0)
#define CFRUNLOOP_SLEEP_ENABLED() (0)
#define CFRUNLOOP_SOURCE_FIRED(arg0, arg1, arg2) do { } while (0)
#define CFRUNLOOP_SOURCE_FIRED_ENABLED() (0)
#define CFRUNLOOP_TIMER_CREATED(arg0, arg1, arg2, arg3, arg4, arg5, arg6) do { } while (0)
#define CFRUNLOOP_TIMER_CREATED_ENABLED() (0)
#define CFRUNLOOP_TIMER_FIRED(arg0, arg1, arg2, arg3, arg4) do { } while (0)
#define CFRUNLOOP_TIMER_FIRED_ENABLED() (0)
#define CFRUNLOOP_TIMER_RESCHEDULED(arg0, arg1, arg2, arg3, arg4, arg5) do { } while (0)
#define CFRUNLOOP_TIMER_RESCHEDULED_ENABLED() (0)
#define CFRUNLOOP_WAKEUP(arg0) do { } while (0)
#define CFRUNLOOP_WAKEUP_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_DISPATCH() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_DISPATCH_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_NOTHING() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_NOTHING_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_SOURCE() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_SOURCE_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_TIMEOUT() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_TIMEOUT_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_TIMER() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_TIMER_ENABLED() (0)
#define CFRUNLOOP_WAKEUP_FOR_WAKEUP() do { } while (0)
#define CFRUNLOOP_WAKEUP_FOR_WAKEUP_ENABLED() (0)
#endif
// In order to reuse most of the code across Mach and Windows v1 RunLoopSources, we define a
// simple abstraction layer spanning Mach ports and Windows HANDLES
#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI
CF_PRIVATE uint32_t __CFGetProcessPortCount(void) {
ipc_info_space_t info;
ipc_info_name_array_t table = 0;
mach_msg_type_number_t tableCount = 0;
ipc_info_tree_name_array_t tree = 0;
mach_msg_type_number_t treeCount = 0;
kern_return_t ret = mach_port_space_info(mach_task_self(), &info, &table, &tableCount, &tree, &treeCount);
if (ret != KERN_SUCCESS) {
return (uint32_t)0;
}
if (table != NULL) {
ret = vm_deallocate(mach_task_self(), (vm_address_t)table, tableCount * sizeof(*table));
}
if (tree != NULL) {
ret = vm_deallocate(mach_task_self(), (vm_address_t)tree, treeCount * sizeof(*tree));
}
return (uint32_t)tableCount;
}
CF_PRIVATE CFArrayRef __CFStopAllThreads(void) {
CFMutableArrayRef suspended_list = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, NULL);
mach_port_t my_task = mach_task_self();
mach_port_t my_thread = mach_thread_self();
thread_act_array_t thr_list = 0;
mach_msg_type_number_t thr_cnt = 0;
// really, should loop doing the stopping until no more threads get added to the list N times in a row
kern_return_t ret = task_threads(my_task, &thr_list, &thr_cnt);
if (ret == KERN_SUCCESS) {
for (CFIndex idx = 0; idx < thr_cnt; idx++) {
thread_act_t thread = thr_list[idx];
if (thread == my_thread) continue;
if (CFArrayContainsValue(suspended_list, CFRangeMake(0, CFArrayGetCount(suspended_list)), (const void *)(uintptr_t)thread)) continue;
ret = thread_suspend(thread);
if (ret == KERN_SUCCESS) {
CFArrayAppendValue(suspended_list, (const void *)(uintptr_t)thread);
} else {
mach_port_deallocate(my_task, thread);
}
}
vm_deallocate(my_task, (vm_address_t)thr_list, sizeof(thread_t) * thr_cnt);
}
mach_port_deallocate(my_task, my_thread);
return suspended_list;
}
CF_PRIVATE void __CFRestartAllThreads(CFArrayRef threads) {
for (CFIndex idx = 0; idx < CFArrayGetCount(threads); idx++) {
thread_act_t thread = (thread_act_t)(uintptr_t)CFArrayGetValueAtIndex(threads, idx);
kern_return_t ret = thread_resume(thread);
if (ret != KERN_SUCCESS) CRASH("*** Failure from thread_resume (%d) ***", ret);
mach_port_deallocate(mach_task_self(), thread);
}
}
static uint32_t __CF_last_warned_port_count = 0;
static void foo() __attribute__((unused));
static void foo() {
uint32_t pcnt = __CFGetProcessPortCount();
if (__CF_last_warned_port_count + 1000 < pcnt) {
CFArrayRef threads = __CFStopAllThreads();
// do stuff here
CFOptionFlags responseFlags = 0;
SInt32 result = CFUserNotificationDisplayAlert(0.0, kCFUserNotificationCautionAlertLevel, NULL, NULL, NULL, CFSTR("High Mach Port Usage"), CFSTR("This application is using a lot of Mach ports."), CFSTR("Default"), CFSTR("Altern"), CFSTR("Other b"), &responseFlags);
if (0 != result) {
CFLog(3, CFSTR("ERROR"));
} else {
switch (responseFlags) {
case kCFUserNotificationDefaultResponse: CFLog(3, CFSTR("DefaultR")); break;
case kCFUserNotificationAlternateResponse: CFLog(3, CFSTR("AltR")); break;
case kCFUserNotificationOtherResponse: CFLog(3, CFSTR("OtherR")); break;
case kCFUserNotificationCancelResponse: CFLog(3, CFSTR("CancelR")); break;
}
}
__CFRestartAllThreads(threads);
CFRelease(threads);
__CF_last_warned_port_count = pcnt;
}
}
typedef mach_port_t __CFPort;
#define CFPORT_NULL MACH_PORT_NULL
typedef mach_port_t __CFPortSet;
static void __THE_SYSTEM_HAS_NO_PORTS_AVAILABLE__(kern_return_t ret) __attribute__((noinline));
static void __THE_SYSTEM_HAS_NO_PORTS_AVAILABLE__(kern_return_t ret) { HALT; };
static __CFPort __CFPortAllocate(void) {
__CFPort result = CFPORT_NULL;
kern_return_t ret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &result);
if (KERN_SUCCESS != ret) {
char msg[256];
snprintf(msg, 256, "*** The system has no mach ports available. You may be able to diagnose which application(s) are using ports by using 'top' or Activity Monitor. (%d) ***", ret);
CRSetCrashLogMessage(msg);
__THE_SYSTEM_HAS_NO_PORTS_AVAILABLE__(ret);
return CFPORT_NULL;
}
ret = mach_port_insert_right(mach_task_self(), result, result, MACH_MSG_TYPE_MAKE_SEND);
if (KERN_SUCCESS != ret) CRASH("*** Unable to set send right on mach port. (%d) ***", ret);
mach_port_limits_t limits;
limits.mpl_qlimit = 1;
ret = mach_port_set_attributes(mach_task_self(), result, MACH_PORT_LIMITS_INFO, (mach_port_info_t)&limits, MACH_PORT_LIMITS_INFO_COUNT);
if (KERN_SUCCESS != ret) CRASH("*** Unable to set attributes on mach port. (%d) ***", ret);
return result;
}
CF_INLINE void __CFPortFree(__CFPort port) {
mach_port_destroy(mach_task_self(), port);
}
static void __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__(kern_return_t ret) __attribute__((noinline));
static void __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__(kern_return_t ret) { HALT; };
CF_INLINE __CFPortSet __CFPortSetAllocate(void) {
__CFPortSet result;
kern_return_t ret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_PORT_SET, &result);
if (KERN_SUCCESS != ret) { __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__(ret); }
return (KERN_SUCCESS == ret) ? result : CFPORT_NULL;
}
CF_INLINE kern_return_t __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
if (MACH_PORT_NULL == port) {
return -1;
}
return mach_port_insert_member(mach_task_self(), port, portSet);
}
CF_INLINE kern_return_t __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
if (MACH_PORT_NULL == port) {
return -1;
}
return mach_port_extract_member(mach_task_self(), port, portSet);
}
CF_INLINE void __CFPortSetFree(__CFPortSet portSet) {
kern_return_t ret;
mach_port_name_array_t array;
mach_msg_type_number_t idx, number;
ret = mach_port_get_set_status(mach_task_self(), portSet, &array, &number);
if (KERN_SUCCESS == ret) {
for (idx = 0; idx < number; idx++) {
mach_port_extract_member(mach_task_self(), array[idx], portSet);
}
vm_deallocate(mach_task_self(), (vm_address_t)array, number * sizeof(mach_port_name_t));
}
mach_port_destroy(mach_task_self(), portSet);
}
#elif DEPLOYMENT_TARGET_WINDOWS
typedef HANDLE __CFPort;
#define CFPORT_NULL NULL
// A simple dynamic array of HANDLEs, which grows to a high-water mark
typedef struct ___CFPortSet {
uint16_t used;
uint16_t size;
HANDLE *handles;
CFSpinLock_t lock; // insert and remove must be thread safe, like the Mach calls
} *__CFPortSet;
CF_INLINE __CFPort __CFPortAllocate(void) {
return CreateEventA(NULL, true, false, NULL);
}
CF_INLINE void __CFPortFree(__CFPort port) {
CloseHandle(port);
}
static __CFPortSet __CFPortSetAllocate(void) {
__CFPortSet result = (__CFPortSet)CFAllocatorAllocate(kCFAllocatorSystemDefault, sizeof(struct ___CFPortSet), 0);
result->used = 0;
result->size = 4;
result->handles = (HANDLE *)CFAllocatorAllocate(kCFAllocatorSystemDefault, result->size * sizeof(HANDLE), 0);
CF_SPINLOCK_INIT_FOR_STRUCTS(result->lock);
return result;
}
static void __CFPortSetFree(__CFPortSet portSet) {
CFAllocatorDeallocate(kCFAllocatorSystemDefault, portSet->handles);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, portSet);
}
// Returns portBuf if ports fit in that space, else returns another ptr that must be freed
static __CFPort *__CFPortSetGetPorts(__CFPortSet portSet, __CFPort *portBuf, uint32_t bufSize, uint32_t *portsUsed) {
__CFSpinLock(&(portSet->lock));
__CFPort *result = portBuf;
if (bufSize < portSet->used)
result = (__CFPort *)CFAllocatorAllocate(kCFAllocatorSystemDefault, portSet->used * sizeof(HANDLE), 0);
if (portSet->used > 1) {
// rotate the ports to vaguely simulate round-robin behaviour
uint16_t lastPort = portSet->used - 1;
HANDLE swapHandle = portSet->handles[0];
memmove(portSet->handles, &portSet->handles[1], lastPort * sizeof(HANDLE));
portSet->handles[lastPort] = swapHandle;
}
memmove(result, portSet->handles, portSet->used * sizeof(HANDLE));
*portsUsed = portSet->used;
__CFSpinUnlock(&(portSet->lock));
return result;
}
static kern_return_t __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
if (NULL == port) {
return -1;
}
__CFSpinLock(&(portSet->lock));
if (portSet->used >= portSet->size) {
portSet->size += 4;
portSet->handles = (HANDLE *)CFAllocatorReallocate(kCFAllocatorSystemDefault, portSet->handles, portSet->size * sizeof(HANDLE), 0);
}
if (portSet->used >= MAXIMUM_WAIT_OBJECTS) {
CFLog(kCFLogLevelWarning, CFSTR("*** More than MAXIMUM_WAIT_OBJECTS (%d) ports add to a port set. The last ones will be ignored."), MAXIMUM_WAIT_OBJECTS);
}
portSet->handles[portSet->used++] = port;
__CFSpinUnlock(&(portSet->lock));
return KERN_SUCCESS;
}
static kern_return_t __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
int i, j;
if (NULL == port) {
return -1;
}
__CFSpinLock(&(portSet->lock));
for (i = 0; i < portSet->used; i++) {
if (portSet->handles[i] == port) {
for (j = i+1; j < portSet->used; j++) {
portSet->handles[j-1] = portSet->handles[j];
}
portSet->used--;
__CFSpinUnlock(&(portSet->lock));
return true;
}
}
__CFSpinUnlock(&(portSet->lock));
return KERN_SUCCESS;
}
#endif
#if !defined(__MACTYPES__) && !defined(_OS_OSTYPES_H)
#if defined(__BIG_ENDIAN__)
typedef struct UnsignedWide {
UInt32 hi;
UInt32 lo;
} UnsignedWide;
#elif defined(__LITTLE_ENDIAN__)
typedef struct UnsignedWide {
UInt32 lo;
UInt32 hi;
} UnsignedWide;
#endif
typedef UnsignedWide AbsoluteTime;
#endif
#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI
#if USE_DISPATCH_SOURCE_FOR_TIMERS
#endif
#if USE_MK_TIMER_TOO
extern mach_port_name_t mk_timer_create(void);
extern kern_return_t mk_timer_destroy(mach_port_name_t name);
extern kern_return_t mk_timer_arm(mach_port_name_t name, AbsoluteTime expire_time);
extern kern_return_t mk_timer_cancel(mach_port_name_t name, AbsoluteTime *result_time);
CF_INLINE AbsoluteTime __CFUInt64ToAbsoluteTime(uint64_t x) {
AbsoluteTime a;
a.hi = x >> 32;
a.lo = x & (uint64_t)0xFFFFFFFF;
return a;
}
#endif
/**
* 向指定端口发送一条消息
* 该函数只在CFRunLoopWakeUp函数中调用了一次
*
* @param port 端口 ，传入的是rl->_wakeUpPort
* @param msg_id 内核消息id，传入的是0
* @param options 传入的是MACH_SEND_TIMEOUT
* @param timeout 传入的是0
*
* @return
*/
static uint32_t __CFSendTrivialMachMessage(mach_port_t port, uint32_t msg_id, CFOptionFlags options, uint32_t timeout) {
kern_return_t result;
//构建内核消息
mach_msg_header_t header;
header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
header.msgh_size = sizeof(mach_msg_header_t);
header.msgh_remote_port = port; //目标端口是_wakeUpPort
header.msgh_local_port = MACH_PORT_NULL;
header.msgh_id = msg_id;
//发送消息
result = mach_msg(&header, MACH_SEND_MSG|options, header.msgh_size, 0, MACH_PORT_NULL, timeout, MACH_PORT_NULL);
if (result == MACH_SEND_TIMED_OUT) mach_msg_destroy(&header);
return result;
}
#elif DEPLOYMENT_TARGET_WINDOWS
static HANDLE mk_timer_create(void) {
return CreateWaitableTimer(NULL, FALSE, NULL);
}
static kern_return_t mk_timer_destroy(HANDLE name) {
BOOL res = CloseHandle(name);
if (!res) {
DWORD err = GetLastError();
CFLog(kCFLogLevelError, CFSTR("CFRunLoop: Unable to destroy timer: %d"), err);
}
return (int)res;
}
static kern_return_t mk_timer_arm(HANDLE name, LARGE_INTEGER expire_time) {
BOOL res = SetWaitableTimer(name, &expire_time, 0, NULL, NULL, FALSE);
if (!res) {
DWORD err = GetLastError();
CFLog(kCFLogLevelError, CFSTR("CFRunLoop: Unable to set timer: %d"), err);
}
return (int)res;
}
static kern_return_t mk_timer_cancel(HANDLE name, LARGE_INTEGER *result_time) {
BOOL res = CancelWaitableTimer(name);
if (!res) {
DWORD err = GetLastError();
CFLog(kCFLogLevelError, CFSTR("CFRunLoop: Unable to cancel timer: %d"), err);
}
return (int)res;
}
// The name of this function is a lie on Windows. The return value matches the argument of the fake mk_timer functions above. Note that the Windows timers expect to be given "system time". We have to do some calculations to get the right value, which is a FILETIME-like value.
CF_INLINE LARGE_INTEGER __CFUInt64ToAbsoluteTime(uint64_t desiredFireTime) {
LARGE_INTEGER result;
// There is a race we know about here, (timer fire time calculated -> thread suspended -> timer armed == late timer fire), but we don't have a way to avoid it at this time, since the only way to specify an absolute value to the timer is to calculate the relative time first. Fixing that would probably require not using the TSR for timers on Windows.
uint64_t now = mach_absolute_time();
if (now > desiredFireTime) {
result.QuadPart = 0;
} else {
uint64_t timeDiff = desiredFireTime - now;
CFTimeInterval amountOfTimeToWait = __CFTSRToTimeInterval(timeDiff);
// Result is in 100 ns (10**-7 sec) units to be consistent with a FILETIME.
// CFTimeInterval is in seconds.
result.QuadPart = -(amountOfTimeToWait * 10000000);
}
return result;
}
#endif
#pragma mark -
#pragma mark Modes
/* unlock a run loop and modes before doing callouts/sleeping */
/* never try to take the run loop lock with a mode locked */
/* be very careful of common subexpression elimination and compacting code, particular across locks and unlocks! */
/* run loop mode structures should never be deallocated, even if they become empty */
static CFTypeID __kCFRunLoopModeTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopSourceTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopObserverTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopTimerTypeID = _kCFRuntimeNotATypeID;
typedef struct __CFRunLoopMode *CFRunLoopModeRef;
struct __CFRunLoopMode {
CFRuntimeBase _base;
pthread_mutex_t _lock; /* must have the run loop locked before locking this */
CFStringRef _name; //mode名称
Boolean _stopped; //mode是否被终止
char _padding[3];
//几种事件
CFMutableSetRef _sources0; //sources0
CFMutableSetRef _sources1; //sources1
CFMutableArrayRef _observers; //通知
CFMutableArrayRef _timers; //定时器
CFMutableDictionaryRef _portToV1SourceMap; //字典 key是mach_port_t，value是CFRunLoopSourceRef
__CFPortSet _portSet; //保存所有需要监听的port，比如_wakeUpPort，_timerPort都保存在这个数组中
CFIndex _observerMask;
#if USE_DISPATCH_SOURCE_FOR_TIMERS
dispatch_source_t _timerSource;
dispatch_queue_t _queue;
Boolean _timerFired; // set to true by the source when a timer has fired
Boolean _dispatchTimerArmed;
#endif
#if USE_MK_TIMER_TOO
mach_port_t _timerPort;
Boolean _mkTimerArmed;
#endif
#if DEPLOYMENT_TARGET_WINDOWS
DWORD _msgQMask;
void (*_msgPump)(void);
#endif
uint64_t _timerSoftDeadline; /* TSR */
uint64_t _timerHardDeadline; /* TSR */
};
CF_INLINE void __CFRunLoopModeLock(CFRunLoopModeRef rlm) {
pthread_mutex_lock(&(rlm->_lock));
//CFLog(6, CFSTR("__CFRunLoopModeLock locked %p"), rlm);
}
CF_INLINE void __CFRunLoopModeUnlock(CFRunLoopModeRef rlm) {
//CFLog(6, CFSTR("__CFRunLoopModeLock unlocking %p"), rlm);
pthread_mutex_unlock(&(rlm->_lock));
}
static Boolean __CFRunLoopModeEqual(CFTypeRef cf1, CFTypeRef cf2) {
CFRunLoopModeRef rlm1 = (CFRunLoopModeRef)cf1;
CFRunLoopModeRef rlm2 = (CFRunLoopModeRef)cf2;
return CFEqual(rlm1->_name, rlm2->_name);
}
static CFHashCode __CFRunLoopModeHash(CFTypeRef cf) {
CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
return CFHash(rlm->_name);
}
static CFStringRef __CFRunLoopModeCopyDescription(CFTypeRef cf) {
CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
CFMutableStringRef result;
result = CFStringCreateMutable(kCFAllocatorSystemDefault, 0);
CFStringAppendFormat(result, NULL, CFSTR("<CFRunLoopMode %p [%p]>{name = %@, "), rlm, CFGetAllocator(rlm), rlm->_name);
CFStringAppendFormat(result, NULL, CFSTR("port set = 0x%x, "), rlm->_portSet);
#if USE_DISPATCH_SOURCE_FOR_TIMERS
CFStringAppendFormat(result, NULL, CFSTR("queue = %p, "), rlm->_queue);
CFStringAppendFormat(result, NULL, CFSTR("source = %p (%s), "), rlm->_timerSource, rlm->_timerFired ? "fired" : "not fired");
#endif
#if USE_MK_TIMER_TOO
CFStringAppendFormat(result, NULL, CFSTR("timer port = 0x%x, "), rlm->_timerPort);
#endif
#if DEPLOYMENT_TARGET_WINDOWS
CFStringAppendFormat(result, NULL, CFSTR("MSGQ mask = %p, "), rlm->_msgQMask);
#endif
CFStringAppendFormat(result, NULL, CFSTR("\n\tsources0 = %@,\n\tsources1 = %@,\n\tobservers = %@,\n\ttimers = %@,\n\tcurrently %0.09g (%lld) / soft deadline in: %0.09g sec (@ %lld) / hard deadline in: %0.09g sec (@ %lld)\n},\n"), rlm->_sources0, rlm->_sources1, rlm->_observers, rlm->_timers, CFAbsoluteTimeGetCurrent(), mach_absolute_time(), __CFTSRToTimeInterval(rlm->_timerSoftDeadline - mach_absolute_time()), rlm->_timerSoftDeadline, __CFTSRToTimeInterval(rlm->_timerHardDeadline - mach_absolute_time()), rlm->_timerHardDeadline);
return result;
}
static void __CFRunLoopModeDeallocate(CFTypeRef cf) {
CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
if (NULL != rlm->_sources0) CFRelease(rlm->_sources0);
if (NULL != rlm->_sources1) CFRelease(rlm->_sources1);
if (NULL != rlm->_observers) CFRelease(rlm->_observers);
if (NULL != rlm->_timers) CFRelease(rlm->_timers);
if (NULL != rlm->_portToV1SourceMap) CFRelease(rlm->_portToV1SourceMap);
CFRelease(rlm->_name);
__CFPortSetFree(rlm->_portSet);
#if USE_DISPATCH_SOURCE_FOR_TIMERS
if (rlm->_timerSource) {
dispatch_source_cancel(rlm->_timerSource);
dispatch_release(rlm->_timerSource);
}
if (rlm->_queue) {
dispatch_release(rlm->_queue);
}
#endif
#if USE_MK_TIMER_TOO
if (MACH_PORT_NULL != rlm->_timerPort) mk_timer_destroy(rlm->_timerPort);
#endif
pthread_mutex_destroy(&rlm->_lock);
memset((char *)cf + sizeof(CFRuntimeBase), 0x7C, sizeof(struct __CFRunLoopMode) - sizeof(CFRuntimeBase));
}
#pragma mark -
#pragma mark Run Loops
struct _block_item {
struct _block_item *_next;
CFTypeRef _mode; // CFString or CFSet
void (^_block)(void);
};
typedef struct _per_run_data {
uint32_t a;
uint32_t b;
uint32_t stopped;
uint32_t ignoreWakeUps;
} _per_run_data;
struct __CFRunLoop {
CFRuntimeBase _base;
pthread_mutex_t _lock; /* locked for accessing mode list */
__CFPort _wakeUpPort; // used for CFRunLoopWakeUp 内核向该端口发送消息可以唤醒runloop
Boolean _unused;
volatile _per_run_data *_perRunData; // reset for runs of the run loop
pthread_t _pthread; //RunLoop对应的线程
uint32_t _winthread;
CFMutableSetRef _commonModes; //存储的是字符串，记录所有标记为common的mode
CFMutableSetRef _commonModeItems;//存储所有commonMode的item(source、timer、observer)
CFRunLoopModeRef _currentMode; //当前运行的mode
CFMutableSetRef _modes; //存储的是CFRunLoopModeRef
struct _block_item *_blocks_head;//doblocks的时候用到
struct _block_item *_blocks_tail;
CFTypeRef _counterpart;
};
/* Bit 0 of the base reserved bits is used for stopped state */
/* Bit 1 of the base reserved bits is used for sleeping state */
/* Bit 2 of the base reserved bits is used for deallocating state */
CF_INLINE volatile _per_run_data *__CFRunLoopPushPerRunData(CFRunLoopRef rl) {
volatile _per_run_data *previous = rl->_perRunData;
rl->_perRunData = (volatile _per_run_data *)CFAllocatorAllocate(kCFAllocatorSystemDefault, sizeof(_per_run_data), 0);
rl->_perRunData->a = 0x4346524C;
rl->_perRunData->b = 0x4346524C; // 'CFRL'
rl->_perRunData->stopped = 0x00000000;
rl->_perRunData->ignoreWakeUps = 0x00000000;
return previous;
}
CF_INLINE void __CFRunLoopPopPerRunData(CFRunLoopRef rl, volatile _per_run_data *previous) {
if (rl->_perRunData) CFAllocatorDeallocate(kCFAllocatorSystemDefault, (void *)rl->_perRunData);
rl->_perRunData = previous;
}
CF_INLINE Boolean __CFRunLoopIsStopped(CFRunLoopRef rl) {
return (rl->_perRunData->stopped) ? true : false;
}
//设置runloop为终止状态
CF_INLINE void __CFRunLoopSetStopped(CFRunLoopRef rl) {
rl->_perRunData->stopped = 0x53544F50; // 'STOP'
}
CF_INLINE void __CFRunLoopUnsetStopped(CFRunLoopRef rl) {
rl->_perRunData->stopped = 0x0;
}
//判断是否是不可以唤醒状态，如果ignoreWakeUps指向0x0，则返回false，表示当前可以被唤醒
CF_INLINE Boolean __CFRunLoopIsIgnoringWakeUps(CFRunLoopRef rl) {
return (rl->_perRunData->ignoreWakeUps) ? true : false;
}
//设置runloop为不可以唤醒状态
CF_INLINE void __CFRunLoopSetIgnoreWakeUps(CFRunLoopRef rl) {
rl->_perRunData->ignoreWakeUps = 0x57414B45; // 'WAKE'
}
//设置为可以被唤醒状态
CF_INLINE void __CFRunLoopUnsetIgnoreWakeUps(CFRunLoopRef rl) {
rl->_perRunData->ignoreWakeUps = 0x0;
}
//是否为休眠状态
CF_INLINE Boolean __CFRunLoopIsSleeping(CFRunLoopRef rl) {
return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1);
}
//设置为休眠状态
CF_INLINE void __CFRunLoopSetSleeping(CFRunLoopRef rl) {
__CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1, 1);
}
//取消休眠状态
CF_INLINE void __CFRunLoopUnsetSleeping(CFRunLoopRef rl) {
__CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1, 0);
}
CF_INLINE Boolean __CFRunLoopIsDeallocating(CFRunLoopRef rl) {
return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 2, 2);
}
CF_INLINE void __CFRunLoopSetDeallocating(CFRunLoopRef rl) {
__CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 2, 2, 1);
}
CF_INLINE void __CFRunLoopLock(CFRunLoopRef rl) {
pthread_mutex_lock(&(((CFRunLoopRef)rl)->_lock));
// CFLog(6, CFSTR("__CFRunLoopLock locked %p"), rl);
}
CF_INLINE void __CFRunLoopUnlock(CFRunLoopRef rl) {
// CFLog(6, CFSTR("__CFRunLoopLock unlocking %p"), rl);
pthread_mutex_unlock(&(((CFRunLoopRef)rl)->_lock));
}
static CFStringRef __CFRunLoopCopyDescription(CFTypeRef cf) {
CFRunLoopRef rl = (CFRunLoopRef)cf;
CFMutableStringRef result;
result = CFStringCreateMutable(kCFAllocatorSystemDefault, 0);
#if DEPLOYMENT_TARGET_WINDOWS
CFStringAppendFormat(result, NULL, CFSTR("<CFRunLoop %p [%p]>{wakeup port = 0x%x, stopped = %s, ignoreWakeUps = %s, \ncurrent mode = %@,\n"), cf, CFGetAllocator(cf), rl->_wakeUpPort, __CFRunLoopIsStopped(rl) ? "true" : "false", __CFRunLoopIsIgnoringWakeUps(rl) ? "true" : "false", rl->_currentMode ? rl->_currentMode->_name : CFSTR("(none)"));
#else
CFStringAppendFormat(result, NULL, CFSTR("<CFRunLoop %p [%p]>{wakeup port = 0x%x, stopped = %s, ignoreWakeUps = %s, \ncurrent mode = %@,\n"), cf, CFGetAllocator(cf), rl->_wakeUpPort, __CFRunLoopIsStopped(rl) ? "true" : "false", __CFRunLoopIsIgnoringWakeUps(rl) ? "true" : "false", rl->_currentMode ? rl->_currentMode->_name : CFSTR("(none)"));
#endif
CFStringAppendFormat(result, NULL, CFSTR("common modes = %@,\ncommon mode items = %@,\nmodes = %@}\n"), rl->_commonModes, rl->_commonModeItems, rl->_modes);
return result;
}
CF_PRIVATE void __CFRunLoopDump() { // __private_extern__ to keep the compiler from discarding it
CFShow(CFCopyDescription(CFRunLoopGetCurrent()));
}
CF_INLINE void __CFRunLoopLockInit(pthread_mutex_t *lock) {
pthread_mutexattr_t mattr;
pthread_mutexattr_init(&mattr);
pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_RECURSIVE);
int32_t mret = pthread_mutex_init(lock, &mattr);
pthread_mutexattr_destroy(&mattr);
if (0 != mret) {
}
}
/* call with rl locked, returns mode locked */
//查找某个Mode，没有则根据create参数决定是否创建
static CFRunLoopModeRef __CFRunLoopFindMode(CFRunLoopRef rl, CFStringRef modeName, Boolean create) {
CHECK_FOR_FORK();
CFRunLoopModeRef rlm;
//声明一个__CFRunLoopMode 并把name赋值为传入的modeName
struct __CFRunLoopMode srlm;
//把srlm中的所有字节都替换为0，也就是对srlm进行清零操作
memset(&srlm, 0, sizeof(srlm));
_CFRuntimeSetInstanceTypeIDAndIsa(&srlm, __kCFRunLoopModeTypeID);
srlm._name = modeName;
//从modes中查找
rlm = (CFRunLoopModeRef)CFSetGetValue(rl->_modes, &srlm);
if (NULL != rlm) {
//标记mode为lock状态并返回
__CFRunLoopModeLock(rlm);
return rlm;
}
if (!create) {
return NULL;
}
//如果在modes中没有找到对应name的mode，并且调用者传入true，则走下面的逻辑创建一个新的mode
//初始化rlm
rlm = (CFRunLoopModeRef)_CFRuntimeCreateInstance(kCFAllocatorSystemDefault, __kCFRunLoopModeTypeID, sizeof(struct __CFRunLoopMode) - sizeof(CFRuntimeBase), NULL);
if (NULL == rlm) {
return NULL;
}
//对结构体中的各项进行赋值
__CFRunLoopLockInit(&rlm->_lock);
rlm->_name = CFStringCreateCopy(kCFAllocatorSystemDefault, modeName);
rlm->_stopped = false;
rlm->_portToV1SourceMap = NULL;
rlm->_sources0 = NULL;
rlm->_sources1 = NULL;
rlm->_observers = NULL;
rlm->_timers = NULL;
rlm->_observerMask = 0;
rlm->_portSet = __CFPortSetAllocate();
rlm->_timerSoftDeadline = UINT64_MAX;
rlm->_timerHardDeadline = UINT64_MAX;
kern_return_t ret = KERN_SUCCESS;
#if USE_DISPATCH_SOURCE_FOR_TIMERS
rlm->_timerFired = false;
rlm->_queue = _dispatch_runloop_root_queue_create_4CF("Run Loop Mode Queue", 0);
mach_port_t queuePort = _dispatch_runloop_root_queue_get_port_4CF(rlm->_queue);
if (queuePort == MACH_PORT_NULL) CRASH("*** Unable to create run loop mode queue port. (%d) ***", -1);
rlm->_timerSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, rlm->_queue);
__block Boolean *timerFiredPointer = &(rlm->_timerFired);
dispatch_source_set_event_handler(rlm->_timerSource, ^{
*timerFiredPointer = true;
});
// Set timer to far out there. The unique leeway makes this timer easy to spot in debug output.
_dispatch_source_set_runloop_timer_4CF(rlm->_timerSource, DISPATCH_TIME_FOREVER, DISPATCH_TIME_FOREVER, 321);
dispatch_resume(rlm->_timerSource);
ret = __CFPortSetInsert(queuePort, rlm->_portSet);
if (KERN_SUCCESS != ret) CRASH("*** Unable to insert timer port into port set. (%d) ***", ret);
#endif
#if USE_MK_TIMER_TOO
rlm->_timerPort = mk_timer_create();
ret = __CFPortSetInsert(rlm->_timerPort, rlm->_portSet);
if (KERN_SUCCESS != ret) CRASH("*** Unable to insert timer port into port set. (%d) ***", ret);
#endif
ret = __CFPortSetInsert(rl->_wakeUpPort, rlm->_portSet);
if (KERN_SUCCESS != ret) CRASH("*** Unable to insert wake up port into port set. (%d) ***", ret);
#if DEPLOYMENT_TARGET_WINDOWS
rlm->_msgQMask = 0;
rlm->_msgPump = NULL;
#endif
//把新创建的mode加入到runloop的modes数组中
CFSetAddValue(rl->_modes, rlm);
CFRelease(rlm);
__CFRunLoopModeLock(rlm); /* return mode locked */
return rlm;
}
// expects rl and rlm locked
static Boolean __CFRunLoopModeIsEmpty(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFRunLoopModeRef previousMode) {
CHECK_FOR_FORK();
if (NULL == rlm) return true;
#if DEPLOYMENT_TARGET_WINDOWS
if (0 != rlm->_msgQMask) return false;
#endif
Boolean libdispatchQSafe = pthread_main_np() && ((HANDLE_DISPATCH_ON_BASE_INVOCATION_ONLY && NULL == previousMode) || (!HANDLE_DISPATCH_ON_BASE_INVOCATION_ONLY && 0 == _CFGetTSD(__CFTSDKeyIsInGCDMainQ)));
if (libdispatchQSafe && (CFRunLoopGetMain() == rl) && CFSetContainsValue(rl->_commonModes, rlm->_name)) return false; // represents the libdispatch main queue
if (NULL != rlm->_sources0 && 0 < CFSetGetCount(rlm->_sources0)) return false;
if (NULL != rlm->_sources1 && 0 < CFSetGetCount(rlm->_sources1)) return false;
if (NULL != rlm->_timers && 0 < CFArrayGetCount(rlm->_timers)) return false;
struct _block_item *item = rl->_blocks_head;
while (item) {
struct _block_item *curr = item;
item = item->_next;
Boolean doit = false;
if (CFStringGetTypeID() == CFGetTypeID(curr->_mode)) {
doit = CFEqual(curr->_mode, rlm->_name) || (CFEqual(curr->_mode, kCFRunLoopCommonModes) && CFSetContainsValue(rl->_commonModes, rlm->_name));
} else {
doit = CFSetContainsValue((CFSetRef)curr->_mode, rlm->_name) || (CFSetContainsValue((CFSetRef)curr->_mode, kCFRunLoopCommonModes) && CFSetContainsValue(rl->_commonModes, rlm->_name));
}
if (doit) return false;
}
return true;
}
#if DEPLOYMENT_TARGET_WINDOWS
uint32_t _CFRunLoopGetWindowsMessageQueueMask(CFRunLoopRef rl, CFStringRef modeName) {
if (modeName == kCFRunLoopCommonModes) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopGetWindowsMessageQueueMask: kCFRunLoopCommonModes unsupported"));
HALT;
}
DWORD result = 0;
__CFRunLoopLock(rl);
CFRunLoopModeRef rlm = __CFRunLoopFindMode(rl, modeName, false);
if (rlm) {
result = rlm->_msgQMask;
__CFRunLoopModeUnlock(rlm);
}
__CFRunLoopUnlock(rl);
return (uint32_t)result;
}
void _CFRunLoopSetWindowsMessageQueueMask(CFRunLoopRef rl, uint32_t mask, CFStringRef modeName) {
if (modeName == kCFRunLoopCommonModes) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopSetWindowsMessageQueueMask: kCFRunLoopCommonModes unsupported"));
HALT;
}
__CFRunLoopLock(rl);
CFRunLoopModeRef rlm = __CFRunLoopFindMode(rl, modeName, true);
rlm->_msgQMask = (DWORD)mask;
__CFRunLoopModeUnlock(rlm);
__CFRunLoopUnlock(rl);
}
uint32_t _CFRunLoopGetWindowsThreadID(CFRunLoopRef rl) {
return rl->_winthread;
}
CFWindowsMessageQueueHandler _CFRunLoopGetWindowsMessageQueueHandler(CFRunLoopRef rl, CFStringRef modeName) {
if (modeName == kCFRunLoopCommonModes) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopGetWindowsMessageQueueMask: kCFRunLoopCommonModes unsupported"));
HALT;
}
if (rl != CFRunLoopGetCurrent()) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopGetWindowsMessageQueueHandler: run loop parameter must be the current run loop"));
HALT;
}
void (*result)(void) = NULL;
__CFRunLoopLock(rl);
CFRunLoopModeRef rlm = __CFRunLoopFindMode(rl, modeName, false);
if (rlm) {
result = rlm->_msgPump;
__CFRunLoopModeUnlock(rlm);
}
__CFRunLoopUnlock(rl);
return result;
}
void _CFRunLoopSetWindowsMessageQueueHandler(CFRunLoopRef rl, CFStringRef modeName, CFWindowsMessageQueueHandler func) {
if (modeName == kCFRunLoopCommonModes) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopGetWindowsMessageQueueMask: kCFRunLoopCommonModes unsupported"));
HALT;
}
if (rl != CFRunLoopGetCurrent()) {
CFLog(kCFLogLevelError, CFSTR("_CFRunLoopGetWindowsMessageQueueHandler: run loop parameter must be the current run loop"));
HALT;
}
__CFRunLoopLock(rl);
CFRunLoopModeRef rlm = __CFRunLoopFindMode(rl, modeName, true);
rlm->_msgPump = func;
__CFRunLoopModeUnlock(rlm);
__CFRunLoopUnlock(rl);
}
#endif
#pragma mark -
#pragma mark Sources
/* Bit 3 in the base reserved bits is used for invalid state in run loop objects */
//true if timer is valid; otherwise false.
CF_INLINE Boolean __CFIsValid(const void *cf) {
return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3);
}
//有效状态
CF_INLINE void __CFSetValid(void *cf) {
__CFBitfieldSetValue(((CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3, 1);
}
//无效状态
CF_INLINE void __CFUnsetValid(void *cf) {
__CFBitfieldSetValue(((CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3, 0);
}
struct __CFRunLoopSource {
CFRuntimeBase _base;
uint32_t _bits; //用于标记Signaled状态，source0只有在被标记为Signaled状态，才会被处理
pthread_mutex_t _lock;
CFIndex _order; /* immutable */
CFMutableBagRef _runLoops;
union {
CFRunLoopSourceContext version0; /* immutable, except invalidation */
CFRunLoopSourceContext1 version1; /* immutable, except invalidation */
} _context;
};
/* Bit 1 of the base reserved bits is used for signalled state */
//Source是否被标记为Signaled
CF_INLINE Boolean __CFRunLoopSourceIsSignaled(CFRunLoopSourceRef rls) {
return (Boolean)__CFBitfieldGetValue(rls->_bits, 1, 1);
}
//标记为Signaled
CF_INLINE void __CFRunLoopSourceSetSignaled(CFRunLoopSourceRef rls) {
__CFBitfieldSetValue(rls->_bits, 1, 1, 1);
}