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CFRunLoop.c
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/* CFRunLoop.c
Copyright (c) 1998-2018, Apple Inc. and the Swift project authors
Portions Copyright (c) 2014-2018, Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
Responsibility: Michael LeHew
*/
#include <CoreFoundation/CFRunLoop.h>
#include <CoreFoundation/CFSet.h>
#include <CoreFoundation/CFBag.h>
#include <CoreFoundation/CFNumber.h>
#include <CoreFoundation/CFPreferences.h>
#include "CFInternal.h"
#include "CFRuntime_Internal.h"
#include "CFMachPort_Internal.h"
#include <math.h>
#include <stdio.h>
#include <limits.h>
#if __has_include(<unistd.h>)
#include <unistd.h>
#endif
#if _POSIX_THREADS
#include <pthread.h>
#endif
#if __HAS_DISPATCH__
#include <dispatch/dispatch.h>
#endif
extern void objc_terminate(void);
#if __has_include(<checkint.h>)
#include <checkint.h>
#else
enum {
CHECKINT_NO_ERROR = 0,
CHECKINT_OVERFLOW_ERROR = (1 << 0),
};
CF_INLINE uint64_t check_uint64_add(uint64_t x, uint64_t y, int32_t* err) {
if((ULLONG_MAX - y) < x)
*err = *err | CHECKINT_OVERFLOW_ERROR;
return x + y;
};
#endif
#if TARGET_OS_MAC || TARGET_OS_WIN32
#define USE_DISPATCH_SOURCE_FOR_TIMERS __HAS_DISPATCH__
#define USE_MK_TIMER_TOO 1
#else
#define USE_DISPATCH_SOURCE_FOR_TIMERS 0
#define USE_MK_TIMER_TOO 1
#endif
#if __HAS_DISPATCH__
#if __has_include(<dispatch/private.h>)
#include <dispatch/private.h>
#else
extern dispatch_queue_t _dispatch_runloop_root_queue_create_4CF(const char *_Nullable label, unsigned long flags);
#if USE_DISPATCH_SOURCE_FOR_TIMERS
#if !TARGET_OS_MAC
typedef uint32_t mach_port_t;
#endif
extern mach_port_t _dispatch_runloop_root_queue_get_port_4CF(dispatch_queue_t queue);
#endif
extern void _dispatch_source_set_runloop_timer_4CF(dispatch_source_t source, dispatch_time_t start, uint64_t interval, uint64_t leeway);
extern bool _dispatch_runloop_root_queue_perform_4CF(dispatch_queue_t queue);
#if TARGET_OS_MAC
typedef mach_port_t dispatch_runloop_handle_t;
#elif defined(__linux__) || defined(__FreeBSD__)
typedef int dispatch_runloop_handle_t;
#elif TARGET_OS_WIN32
typedef HANDLE dispatch_runloop_handle_t;
#endif
#endif
#endif
#if TARGET_OS_MAC || DEPLOYMENT_TARGET_SIMULATOR
#include <sys/param.h>
#include <CoreFoundation/CFUserNotification.h>
#include <mach/mach.h>
#include <mach/clock_types.h>
#include <mach/clock.h>
#include <unistd.h>
#include <dlfcn.h>
extern void _dispatch_main_queue_callback_4CF(void *);
extern _CFThreadRef pthread_main_thread_np(void);
typedef struct voucher_s *voucher_t;
extern voucher_t _Nullable voucher_copy(void);
extern void os_release(void *object);
extern mach_port_t _dispatch_get_main_queue_port_4CF(void);
#elif TARGET_OS_WIN32 || TARGET_OS_CYGWIN
#include <process.h>
DISPATCH_EXPORT dispatch_runloop_handle_t _dispatch_get_main_queue_port_4CF(void);
DISPATCH_EXPORT void _dispatch_main_queue_callback_4CF(void * _Null_unspecified);
#define MACH_PORT_NULL 0
#define mach_port_name_t HANDLE
#define mach_port_t HANDLE
#elif TARGET_OS_LINUX
#include <dlfcn.h>
#include <poll.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/timerfd.h>
dispatch_runloop_handle_t _dispatch_get_main_queue_port_4CF(void);
extern void _dispatch_main_queue_callback_4CF(void *_Null_unspecified msg);
#endif
#if TARGET_OS_WIN32 || TARGET_OS_LINUX
CF_EXPORT _CFThreadRef _CF_pthread_main_thread_np(void);
#define pthread_main_thread_np() _CF_pthread_main_thread_np()
#endif
#include <Block.h>
#if __has_include(<Block_private.h>)
#include <Block_private.h>
#elif __has_include("Block_private.h")
#include "Block_private.h"
#endif
// Open source CF may not have this defined.
#ifndef cf_trace
#define cf_trace(...) do {} while (0)
#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 TARGET_OS_WIN32
static _CFThreadRef const kNilPthreadT = INVALID_HANDLE_VALUE;
#define pthreadPointer(a) a
typedef int kern_return_t;
#define KERN_SUCCESS 0
#elif TARGET_OS_LINUX
static _CFThreadRef const kNilPthreadT = (_CFThreadRef)0;
#define pthreadPointer(a) ((void*)a)
typedef int kern_return_t;
#define KERN_SUCCESS 0
#else
static _CFThreadRef const kNilPthreadT = (_CFThreadRef)0;
#define pthreadPointer(a) a
#define lockCount(a) a
#endif
#pragma mark -
#define CF_RUN_LOOP_PROBES 0
#pragma mark CFRunLoopProbes
#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
// NOTE: this is locally defined rather than in CFInternal.h as on Linux,
// `linux/sysctl.h` defines `struct __sysctl_args` with an `__unused` member
// which breaks the build.
#if TARGET_OS_WIN32 || TARGET_OS_CYGWIN || TARGET_OS_LINUX
#ifndef __unused
#if __has_attribute(unused)
#define __unused __attribute__((unused))
#else
#define __unused
#endif
#endif // !defined(__unused)
#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 TARGET_OS_MAC
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 (%x) ***", ret);
mach_port_deallocate(mach_task_self(), thread);
}
}
static uint32_t __CF_last_warned_port_count = 0;
static void foo(void) __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(uintptr_t guard) {
__CFPort result = CFPORT_NULL;
mach_port_options_t options = {
.flags = MPO_CONTEXT_AS_GUARD | MPO_QLIMIT | MPO_INSERT_SEND_RIGHT | MPO_STRICT,
.mpl.mpl_qlimit = 1,
};
kern_return_t const ret = mach_port_construct(mach_task_self(), &options, (mach_port_context_t)guard, &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;
}
return result;
}
CF_INLINE void __CFPortFree(__CFPort port, uintptr_t guard) {
kern_return_t const ret = mach_port_destruct(mach_task_self(), port, -1, (mach_port_context_t)guard);
if (KERN_SUCCESS != ret) {
char msg[256];
snprintf(msg, 256, "*** Unable to destruct port. (0x%x, %d, %p) ***", port, ret, (void *)guard);
CRSetCrashLogMessage(msg);
HALT;
}
}
static void __NO_SPACE__(kern_return_t ret) __attribute__((noinline));
static void __NO_SPACE__(kern_return_t ret) { HALT; };
static void __RESOURCE_SHORTAGE__(kern_return_t ret) __attribute__((noinline));
static void __RESOURCE_SHORTAGE__(kern_return_t ret) { HALT; };
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) {
if (ret == KERN_NO_SPACE) {
__NO_SPACE__(ret);
}
else if (ret == KERN_RESOURCE_SHORTAGE) {
__RESOURCE_SHORTAGE__(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) {
// NOTE: we rely on the impl of mach_port destroy to extract each member, which it does
// ALSO NOTE: Per CoreOS port sets don't have ref counts, so this is equiv to mach_port_destroy, but faster/safer
const kern_return_t ret = mach_port_mod_refs(mach_task_self(), portSet, MACH_PORT_RIGHT_PORT_SET, -1);
if (ret != KERN_SUCCESS) {
CFLog(kCFLogLevelError, CFSTR("error (%d - %s) while trying to free port set: %d"), ret, mach_error_string(ret), portSet);
}
}
#elif TARGET_OS_WIN32 || TARGET_OS_CYGWIN
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;
CFLock_t lock; // insert and remove must be thread safe, like the Mach calls
} *__CFPortSet;
CF_INLINE __CFPort __CFPortAllocate(__unused uintptr_t guard) {
return CreateEventA(NULL, true, false, NULL);
}
CF_INLINE void __CFPortFree(__CFPort port, __unused uintptr_t guard) {
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_LOCK_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) {
__CFLock(&(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;
__CFUnlock(&(portSet->lock));
return result;
}
static kern_return_t __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
if (NULL == port) {
return -1;
}
__CFLock(&(portSet->lock));
if (portSet->used >= portSet->size) {
portSet->size += 4;
portSet->handles = __CFSafelyReallocateWithAllocator(kCFAllocatorSystemDefault, portSet->handles, portSet->size * sizeof(HANDLE), 0, NULL);
}
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;
__CFUnlock(&(portSet->lock));
return KERN_SUCCESS;
}
static kern_return_t __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
int i, j;
if (NULL == port) {
return -1;
}
__CFLock(&(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--;
__CFUnlock(&(portSet->lock));
return true;
}
}
__CFUnlock(&(portSet->lock));
return KERN_SUCCESS;
}
#elif TARGET_OS_LINUX
// eventfd/timerfd descriptor
typedef int __CFPort;
#define CFPORT_NULL -1
#define MACH_PORT_NULL CFPORT_NULL
// epoll file descriptor
typedef int __CFPortSet;
#define CFPORTSET_NULL -1
static __CFPort __CFPortAllocate(__unused uintptr_t guard) {
return eventfd(0, EFD_CLOEXEC|EFD_NONBLOCK);
}
CF_INLINE void __CFPortFree(__CFPort port, __unused uintptr_t guard) {
close(port);
}
CF_INLINE __CFPortSet __CFPortSetAllocate(void) {
return epoll_create1(EPOLL_CLOEXEC);
}
CF_INLINE kern_return_t __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
if (CFPORT_NULL == port) {
return -1;
}
struct epoll_event event;
memset(&event, 0, sizeof(event));
event.data.fd = port;
event.events = EPOLLIN|EPOLLET;
return epoll_ctl(portSet, EPOLL_CTL_ADD, port, &event);
}
CF_INLINE kern_return_t __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
if (CFPORT_NULL == port) {
return -1;
}
return epoll_ctl(portSet, EPOLL_CTL_DEL, port, NULL);
}
CF_INLINE void __CFPortSetFree(__CFPortSet portSet) {
close(portSet);
}
#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 TARGET_OS_MAC
#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_cancel(mach_port_name_t name, AbsoluteTime *result_time);
extern kern_return_t mk_timer_arm(mach_port_name_t name, uint64_t expire_time);
#endif
static uint32_t __CFSendTrivialMachMessage(mach_port_t port, uint32_t msg_id, CFOptionFlags options, uint32_t timeout) {
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;
header.msgh_local_port = MACH_PORT_NULL;
header.msgh_id = msg_id;
kern_return_t const result = mach_msg(&header, MACH_SEND_MSG|options, header.msgh_size, 0, MACH_PORT_NULL, timeout, MACH_PORT_NULL);
__CFMachMessageCheckForAndDestroyUnsentMessage(result, &header);
return result;
}
#elif TARGET_OS_LINUX
static int mk_timer_create(void) {
return timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
}
static kern_return_t mk_timer_destroy(int timer) {
return close(timer);
}
static kern_return_t mk_timer_arm(int timer, int64_t expire_time) {
struct itimerspec ts;
ts.it_value.tv_sec = expire_time / 1000000000UL;
ts.it_value.tv_nsec = expire_time % 1000000000UL;
// Non-repeating timer
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
return timerfd_settime(timer, TFD_TIMER_ABSTIME, &ts, NULL);
}
static kern_return_t mk_timer_cancel(int timer, const void *unused) {
return mk_timer_arm(timer, 0);
}
CF_INLINE int64_t __CFUInt64ToAbsoluteTime(int64_t x) {
return x;
}
#elif TARGET_OS_WIN32
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, uint64_t expire_time) {
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 > expire_time) {
result.QuadPart = 0;
} else {
uint64_t timeDiff = expire_time - 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);
}
BOOL res = SetWaitableTimer(name, &result, 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, AbsoluteTime *result_time) {
BOOL res = CancelWaitableTimer(name);
if (!res) {
DWORD err = GetLastError();
CFLog(kCFLogLevelError, CFSTR("CFRunLoop: Unable to cancel timer: %d"), err);
}
return (int)res;
}
#endif
CF_BREAKPOINT_FUNCTION(void _CFRunLoopError_MainThreadHasExited(void));
#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 */
typedef struct __CFRunLoopMode *CFRunLoopModeRef;
struct __CFRunLoopMode {
CFRuntimeBase _base;
_CFRecursiveMutex _lock; /* must have the run loop locked before locking this */
CFStringRef _name;
Boolean _stopped;
char _padding[3];
CFMutableSetRef _sources0;
CFMutableSetRef _sources1;
CFMutableArrayRef _observers;
CFMutableArrayRef _timers;
CFMutableDictionaryRef _portToV1SourceMap;
__CFPortSet _portSet;
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
__CFPort _timerPort;
Boolean _mkTimerArmed;
#endif
#if TARGET_OS_WIN32
DWORD _msgQMask;
void (*_msgPump)(void);
#endif
uint64_t _timerSoftDeadline; /* TSR */
uint64_t _timerHardDeadline; /* TSR */
};
CF_INLINE void __CFRunLoopModeLock(CFRunLoopModeRef rlm) {
_CFRecursiveMutexLock(&(rlm->_lock));
//CFLog(6, CFSTR("__CFRunLoopModeLock locked %p"), rlm);
}
CF_INLINE void __CFRunLoopModeUnlock(CFRunLoopModeRef rlm) {
//CFLog(6, CFSTR("__CFRunLoopModeLock unlocking %p"), rlm);
_CFRecursiveMutexUnlock(&(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 TARGET_OS_WIN32
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
_CFRecursiveMutexDestroy(&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;
_CFRecursiveMutex _lock; /* locked for accessing mode list */
__CFPort _wakeUpPort; // used for CFRunLoopWakeUp
Boolean _unused;
volatile _per_run_data *_perRunData; // reset for runs of the run loop
_CFThreadRef _pthread;
uint32_t _winthread;
CFMutableSetRef _commonModes;
CFMutableSetRef _commonModeItems;
CFRunLoopModeRef _currentMode;
CFMutableSetRef _modes;
struct _block_item *_blocks_head;
struct _block_item *_blocks_tail;
CFAbsoluteTime _runTime;
CFAbsoluteTime _sleepTime;
CFTypeRef _counterpart;
_Atomic(uint8_t) _fromTSD;
CFLock_t _timerTSRLock;
};
/* 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;
}
CF_INLINE void __CFRunLoopSetStopped(CFRunLoopRef rl) {
rl->_perRunData->stopped = 0x53544F50; // 'STOP'
}
CF_INLINE void __CFRunLoopUnsetStopped(CFRunLoopRef rl) {
rl->_perRunData->stopped = 0x0;
}
CF_INLINE Boolean __CFRunLoopIsIgnoringWakeUps(CFRunLoopRef rl) {
return (rl->_perRunData->ignoreWakeUps) ? true : false;
}
CF_INLINE void __CFRunLoopSetIgnoreWakeUps(CFRunLoopRef rl) {
rl->_perRunData->ignoreWakeUps = 0x57414B45; // 'WAKE'
}
CF_INLINE void __CFRunLoopUnsetIgnoreWakeUps(CFRunLoopRef rl) {
rl->_perRunData->ignoreWakeUps = 0x0;
}
CF_INLINE Boolean __CFRunLoopIsSleeping(CFRunLoopRef rl) {
return __CFRuntimeGetFlag(rl, 1);
}
CF_INLINE void __CFRunLoopSetSleeping(CFRunLoopRef rl) {
__CFRuntimeSetFlag(rl, 1, true);
}
CF_INLINE void __CFRunLoopUnsetSleeping(CFRunLoopRef rl) {
__CFRuntimeSetFlag(rl, 1, false);
}
CF_INLINE Boolean __CFRunLoopIsDeallocating(CFRunLoopRef rl) {
return __CFRuntimeGetFlag(rl, 2);
}
CF_INLINE void __CFRunLoopSetDeallocating(CFRunLoopRef rl) {
__CFRuntimeSetFlag(rl, 2, true);
}
CF_INLINE void __CFRunLoopLock(CFRunLoopRef rl) {
_CFRecursiveMutexLock(&(((CFRunLoopRef)rl)->_lock));
// CFLog(6, CFSTR("__CFRunLoopLock locked %p"), rl);
}
CF_INLINE void __CFRunLoopUnlock(CFRunLoopRef rl) {
// CFLog(6, CFSTR("__CFRunLoopLock unlocking %p"), rl);
_CFRecursiveMutexUnlock(&(((CFRunLoopRef)rl)->_lock));
}
static CFStringRef __CFRunLoopCopyDescription(CFTypeRef cf) {
CFRunLoopRef rl = (CFRunLoopRef)cf;
CFMutableStringRef result;
result = CFStringCreateMutable(kCFAllocatorSystemDefault, 0);
#if TARGET_OS_WIN32
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
CFStringRef desc = CFCopyDescription(CFRunLoopGetCurrent());
CFShow(desc);
CFRelease(desc);
}
/* call with rl locked, returns mode locked */
static CFRunLoopModeRef __CFRunLoopFindMode(CFRunLoopRef rl, CFStringRef modeName, Boolean create) {
CHECK_FOR_FORK();
CFRunLoopModeRef rlm;
struct __CFRunLoopMode srlm;
memset(&srlm, 0, sizeof(srlm));
_CFRuntimeSetInstanceTypeIDAndIsa(&srlm, _kCFRuntimeIDCFRunLoopMode);
srlm._name = modeName;
rlm = (CFRunLoopModeRef)CFSetGetValue(rl->_modes, &srlm);
if (NULL != rlm) {
__CFRunLoopModeLock(rlm);
return rlm;
}
if (!create) {
return NULL;
}
rlm = (CFRunLoopModeRef)_CFRuntimeCreateInstance(kCFAllocatorSystemDefault, _kCFRuntimeIDCFRunLoopMode, sizeof(struct __CFRunLoopMode) - sizeof(CFRuntimeBase), NULL);
if (NULL == rlm) {
return NULL;
}
_CFRecursiveMutexCreate(&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_timer(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();
if (rlm->_timerPort == MACH_PORT_NULL) {
CRASH("*** Unable to create timer Port (%d) ***", rlm->_timerPort);
}
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 TARGET_OS_WIN32
rlm->_msgQMask = 0;
rlm->_msgPump = NULL;
#endif
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 TARGET_OS_WIN32
if (0 != rlm->_msgQMask) return false;
#endif
#if __HAS_DISPATCH__
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
#endif
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 TARGET_OS_WIN32