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Add threads for mach.

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@9574 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Adam Fedor 2001-04-12 21:09:17 +00:00
parent 9670ec5491
commit ce64c6f672
9 changed files with 864 additions and 103 deletions
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9
ChangeLog
View file

@ -1,10 +1,13 @@
2001-04-12 Adam Fedor <fedor@gnu.org>
* Headers/gnustep/base/NSLock.h: Don't include thr.h if NeXT_RUNTIME.
* Headers/gnustep/base/NSLock.h: Include thrmach.h if NeXT_RUNTIME.
* Headers/gnustep/base/NSThread.h: Likewise.
* Headers/gnustep/base/NSObjCRuntime: Include objc-gnu2next if
NeXT_RUNTIME, usr common objc functions for compatibility.
* Headers/gnustep/base/NSObjCRuntime: Include objc-gnu2next.h if
NeXT_RUNTIME, use common objc functions for compatibility.
* Headers/gnustep/base/objc-gnu2next.h: Update, simplify.
* Headers/gnustep/base/thr-mach.h: New file
* Source/thr-mach.m: New file
* Source/GNUmakefile: Update to conditionally compile NeXT files
* Documentation/gsdoc/NSRecursiveLock.gsdoc: Update.

4
Headers/gnustep/base/NSLock.h
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@ -32,8 +32,8 @@
#define _GNUstep_H_NSLock
#include <Foundation/NSObject.h>
#ifndef NeXT_RUNTIME
#include <objc/thr.h>
#ifdef NeXT_RUNTIMME
#include <base/thr-mach.h>
#endif
/*

6
Headers/gnustep/base/NSObjCRuntime.h
View file

@ -84,7 +84,7 @@ GS_EXPORT BOOL GSInstanceVariableInfo(id obj, NSString *iVarName,
GS_EXPORT BOOL GSGetInstanceVariable(id obj, NSString *name, void* data);
GS_EXPORT BOOL GSSetInstanceVariable(id obj, NSString *name, const void* data);
#include <objc-gnu2next.h>
#include <base/objc-gnu2next.h>
/*
* GSObjCClass() return the class of an instance.
@ -93,7 +93,7 @@ GS_EXPORT BOOL GSSetInstanceVariable(id obj, NSString *name, const void* data);
FOUNDATION_STATIC_INLINE Class
GSObjCClass(id obj)
{
return object_get_class(objc);
return object_get_class(obj);
}
/*
@ -103,7 +103,7 @@ GSObjCClass(id obj)
FOUNDATION_STATIC_INLINE BOOL
GSObjCIsInstance(id obj)
{
return CLS_ISCLASS(object_get_class(objc));
return CLS_ISCLASS(object_get_class(obj));
}
/*

4
Headers/gnustep/base/NSThread.h
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@ -25,8 +25,8 @@
#ifndef __NSThread_h_GNUSTEP_BASE_INCLUDE
#define __NSThread_h_GNUSTEP_BASE_INCLUDE
#ifndef NeXT_RUNTIME
#include <objc/thr.h>
#ifdef NeXT_RUNTIMME
#include <base/thr-mach.h>
#endif
#include <Foundation/NSDictionary.h>
#include <Foundation/NSDate.h>

41
Headers/gnustep/base/objc-gnu2next.h
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@ -95,6 +95,47 @@
#define OBJC_READONLY 1
#define OBJC_WRITEONLY 2
/*
** Standard functions for memory allocation and disposal.
** Users should use these functions in their ObjC programs so
** that they work properly with garbage collectors as well as
** can take advantage of the exception/error handling available.
*/
void *
objc_malloc(size_t size);
void *
objc_atomic_malloc(size_t size);
void *
objc_valloc(size_t size);
void *
objc_realloc(void *mem, size_t size);
void *
objc_calloc(size_t nelem, size_t size);
void
objc_free(void *mem);
/*
** Hook functions for memory allocation and disposal.
** This makes it easy to substitute garbage collection systems
** such as Boehm's GC by assigning these function pointers
** to the GC's allocation routines. By default these point
** to the ANSI standard malloc, realloc, free, etc.
**
** Users should call the normal objc routines above for
** memory allocation and disposal within their programs.
*/
objc_EXPORT void *(*_objc_malloc)(size_t);
objc_EXPORT void *(*_objc_atomic_malloc)(size_t);
objc_EXPORT void *(*_objc_valloc)(size_t);
objc_EXPORT void *(*_objc_realloc)(void *, size_t);
objc_EXPORT void *(*_objc_calloc)(size_t, size_t);
objc_EXPORT void (*_objc_free)(void *);
#endif /* NeXT_RUNTIME */
#endif /* __objc_gnu2next_h_GNUSTEP_BASE_INCLUDE */

117
Headers/gnustep/base/thr-mach.h Normal file
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@ -0,0 +1,117 @@
/* Thread and mutex controls for Objective C.
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
GNU CC is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2, or (at your option) any later version.
GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
GNU CC; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* As a special exception, if you link this library with files
compiled with GCC to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
#ifndef __thread_INCLUDE_GNU
#define __thread_INCLUDE_GNU
#include "objc/objc.h"
/*************************************************************************
* Universal static variables:
*/
extern int __objc_thread_exit_status; /* Global exit status. */
/********
* Thread safe implementation types and functions.
*/
/* Thread priorities */
#define OBJC_THREAD_INTERACTIVE_PRIORITY 2
#define OBJC_THREAD_BACKGROUND_PRIORITY 1
#define OBJC_THREAD_LOW_PRIORITY 0
/* A thread */
typedef void * objc_thread_t;
/* This structure represents a single mutual exclusion lock. */
struct objc_mutex
{
volatile objc_thread_t owner; /* Id of thread that owns. */
volatile int depth; /* # of acquires. */
void * backend; /* Specific to backend */
};
typedef struct objc_mutex *objc_mutex_t;
/* This structure represents a single condition mutex */
struct objc_condition
{
void * backend; /* Specific to backend */
};
typedef struct objc_condition *objc_condition_t;
/* Frontend mutex functions */
objc_mutex_t objc_mutex_allocate(void);
int objc_mutex_deallocate(objc_mutex_t mutex);
int objc_mutex_lock(objc_mutex_t mutex);
int objc_mutex_unlock(objc_mutex_t mutex);
int objc_mutex_trylock(objc_mutex_t mutex);
/* Frontend condition mutex functions */
objc_condition_t objc_condition_allocate(void);
int objc_condition_deallocate(objc_condition_t condition);
int objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex);
int objc_condition_signal(objc_condition_t condition);
int objc_condition_broadcast(objc_condition_t condition);
/* Frontend thread functions */
objc_thread_t objc_thread_detach(SEL selector, id object, id argument);
void objc_thread_yield(void);
int objc_thread_exit(void);
int objc_thread_set_priority(int priority);
int objc_thread_get_priority(void);
void * objc_thread_get_data(void);
int objc_thread_set_data(void *value);
objc_thread_t objc_thread_id(void);
void objc_thread_add(void);
void objc_thread_remove(void);
/*
Use this to set the hook function that will be called when the
runtime initially becomes multi threaded.
The hook function is only called once, meaning only when the
2nd thread is spawned, not for each and every thread.
It returns the previous hook function or NULL if there is none.
A program outside of the runtime could set this to some function so
it can be informed; for example, the GNUstep Base Library sets it
so it can implement the NSBecomingMultiThreaded notification.
*/
typedef void (*objc_thread_callback)();
objc_thread_callback objc_set_thread_callback(objc_thread_callback func);
#endif /* not __thread_INCLUDE_GNU */

7
Source/GNUmakefile
View file

@ -93,8 +93,11 @@ o_map.m \
o_map_bas.m \
o_map_cbs.m \
preface.m \
mframe.m \
objc-gnu2next.m
mframe.m
ifeq ($(OBJC_RUNTIME), NeXT)
GNU_MFILES += thr-mach.m objc-gnu2next.m
endif
ifeq ($(GNUSTEP_TARGET_OS), mingw32)
GNU_MFILES += WindowsFileHandle.m libgnustep-base-entry.m

169
Source/objc-gnu2next.m
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@ -23,42 +23,7 @@
*/
#include <config.h>
#include <base/preface.h>
#if NeXT_runtime
/* Deal with strrchr: */
#if STDC_HEADERS || HAVE_STRING_H
#include <string.h>
/* An ANSI string.h and pre-ANSI memory.h might conflict. */
#if !STDC_HEADERS && HAVE_MEMORY_H
#include <memory.h>
#endif /* not STDC_HEADERS and HAVE_MEMORY_H */
#define index strchr
#define rindex strrchr
#define bcopy(s, d, n) memcpy ((d), (s), (n))
#define bcmp(s1, s2, n) memcmp ((s1), (s2), (n))
#define bzero(s, n) memset ((s), 0, (n))
#else /* not STDC_HEADERS and not HAVE_STRING_H */
#include <strings.h>
/* memory.h and strings.h conflict on some systems. */
#endif /* not STDC_HEADERS and not HAVE_STRING_H */
#define ROUND(V, A) \
({ typeof(V) __v=(V); typeof(A) __a=(A); \
__a*((__v+__a-1)/__a); })
static inline int
atoi (const char* str)
{
int res = 0;
while (isdigit (*str))
res *= 10, res += (*str++ - '0');
return res;
}
#include <base/objc-gnu2next.h>
/*
return the size of an object specified by type
@ -444,60 +409,6 @@ objc_get_type_qualifiers (const char* type)
return res;
}
/* GNU Object.[hm] defines -compare:, NeXT doesn't, libcoll needs it. */
@implementation Object (GNUExtensions)
- (int)compare:anotherObject;
{
if ([self isEqual:anotherObject])
return 0;
// Ordering objects by their address is pretty useless,
// so subclasses should override this is some useful way.
else if (self > anotherObject)
return 1;
else
return -1;
}
- shouldNotImplement:(SEL)op
{
return [self error:"should not implement %s", sel_getName (op)];
}
@end
#ifdef objc_fatal
#undef objc_fatal
#endif
void
objc_fatal(const char* msg)
{
write(2, msg, (int)strlen((const char*)msg));
abort();
}
void *__objc_xmalloc (unsigned long size)
{
void* res = (void*) malloc(size);
if(!res)
objc_fatal("Virtual memory exhausted\n");
return res;
}
void*
__objc_xrealloc(void* mem, size_t size)
{
void* res = (void*) realloc(mem, size);
if(!res)
objc_fatal("Virtual memory exhausted\n");
return res;
}
void*
__objc_xcalloc(size_t nelem, size_t size)
{
void* res = (void*)calloc(nelem, size);
if(!res)
objc_fatal("Virtual memory exhausted\n");
return res;
}
/* Returns YES iff t1 and t2 have same method types, but we ignore
the argframe layout */
BOOL
@ -529,4 +440,80 @@ sel_types_match (const char* t1, const char* t2)
#endif /* NeXT_runtime */
/*
** Hook functions for memory allocation and disposal.
** This makes it easy to substitute garbage collection systems
** such as Boehm's GC by assigning these function pointers
** to the GC's allocation routines. By default these point
** to the ANSI standard malloc, realloc, free, etc.
**
** Users should call the normal objc routines above for
** memory allocation and disposal within their programs.
*/
void *(*_objc_malloc)(size_t) = malloc;
void *(*_objc_atomic_malloc)(size_t) = malloc;
void *(*_objc_valloc)(size_t) = malloc;
void *(*_objc_realloc)(void *, size_t) = realloc;
void *(*_objc_calloc)(size_t, size_t) = calloc;
void (*_objc_free)(void *) = free;
/*
** Standard functions for memory allocation and disposal.
** Users should use these functions in their ObjC programs so
** that they work properly with garbage collectors as well as
** can take advantage of the exception/error handling available.
*/
void *
objc_malloc(size_t size)
{
void* res = (void*) (*_objc_malloc)(size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
void *
objc_atomic_malloc(size_t size)
{
void* res = (void*) (*_objc_atomic_malloc)(size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
void *
objc_valloc(size_t size)
{
void* res = (void*) (*_objc_valloc)(size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
void *
objc_realloc(void *mem, size_t size)
{
void* res = (void*) (*_objc_realloc)(mem, size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
void *
objc_calloc(size_t nelem, size_t size)
{
void* res = (void*) (*_objc_calloc)(nelem, size);
if(!res)
objc_error(nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
return res;
}
void
objc_free(void *mem)
{
(*_objc_free)(mem);
}

610
Source/thr-mach.m Normal file
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@ -0,0 +1,610 @@
/* GNU Objective C Runtime Thread Implementation
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
Modified for Mach threads by Bill Bumgarner <bbum@friday.com>
Condition functions added by Mircea Oancea <mircea@first.elcom.pub.ro>
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2, or (at your option) any later version.
GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* As a special exception, if you link this library with files compiled with
GCC to produce an executable, this does not cause the resulting executable
to be covered by the GNU General Public License. This exception does not
however invalidate any other reasons why the executable file might be
covered by the GNU General Public License. */
#include <mach/mach.h>
#include <mach/cthreads.h>
#include <base/objc-gnu2next.h>
#include <base/thr-mach.h>
/* Global exit status. */
int __objc_thread_exit_status = 0;
/* Flag which lets us know if we ever became multi threaded */
int __objc_is_multi_threaded = 0;
/* The hook function called when the runtime becomes multi threaded */
objc_thread_callback _objc_became_multi_threaded = NULL;
/*
Use this to set the hook function that will be called when the
runtime initially becomes multi threaded.
The hook function is only called once, meaning only when the
2nd thread is spawned, not for each and every thread.
It returns the previous hook function or NULL if there is none.
A program outside of the runtime could set this to some function so
it can be informed; for example, the GNUstep Base Library sets it
so it can implement the NSBecomingMultiThreaded notification.
*/
objc_thread_callback objc_set_thread_callback(objc_thread_callback func)
{
objc_thread_callback temp = _objc_became_multi_threaded;
_objc_became_multi_threaded = func;
return temp;
}
/*
Private functions
These functions are utilized by the frontend, but they are not
considered part of the public interface.
*/
/*
First function called in a thread, starts everything else.
This function is passed to the backend by objc_thread_detach
as the starting function for a new thread.
*/
struct __objc_thread_start_state
{
SEL selector;
id object;
id argument;
};
static volatile void
__objc_thread_detach_function(struct __objc_thread_start_state *istate)
{
/* Valid state? */
if (istate) {
id (*imp)(id,SEL,id);
SEL selector = istate->selector;
id object = istate->object;
id argument = istate->argument;
/* Don't need anymore so free it */
objc_free(istate);
/* Clear out the thread local storage */
objc_thread_set_data(NULL);
/* Check to see if we just became multi threaded */
if (!__objc_is_multi_threaded)
{
__objc_is_multi_threaded = 1;
/* Call the hook function */
if (_objc_became_multi_threaded != NULL)
(*_objc_became_multi_threaded)();
}
/* Call the method */
if ((imp = (id(*)(id, SEL, id))objc_msg_lookup(object, selector)))
(*imp)(object, selector, argument);
else
objc_error(object, OBJC_ERR_UNIMPLEMENTED,
"objc_thread_detach called with bad selector.\n");
}
else
objc_error(nil, OBJC_ERR_BAD_STATE,
"objc_thread_detach called with NULL state.\n");
/* Exit the thread */
objc_thread_exit();
}
/*
Frontend functions
These functions constitute the public interface to the Objective-C thread
and mutex functionality.
*/
/* Frontend thread functions */
/*
Detach a new thread of execution and return its id. Returns NULL if fails.
Thread is started by sending message with selector to object. Message
takes a single argument.
*/
objc_thread_t
objc_thread_detach(SEL selector, id object, id argument)
{
struct __objc_thread_start_state *istate;
objc_thread_t thread_id = NULL;
/* Allocate the state structure */
if (!(istate = (struct __objc_thread_start_state *)
objc_malloc(sizeof(*istate))))
return NULL;
/* Initialize the state structure */
istate->selector = selector;
istate->object = object;
istate->argument = argument;
/* lock access */
objc_mutex_lock(__objc_runtime_mutex);
/* Call the backend to spawn the thread */
if ((thread_id = __objc_thread_detach((void *)__objc_thread_detach_function,
istate)) == NULL)
{
/* failed! */
objc_mutex_unlock(__objc_runtime_mutex);
objc_free(istate);
return NULL;
}
/* Increment our thread counter */
__objc_runtime_threads_alive++;
objc_mutex_unlock(__objc_runtime_mutex);
return thread_id;
}
/*
Obtain the maximum thread priority that can set for t. Under the
mach threading model, it is possible for the developer to adjust the
maximum priority downward only-- cannot be raised without superuser
privileges. Once lowered, it cannot be raised.
*/
static int __mach_get_max_thread_priority(cthread_t t, int *base)
{
thread_t threadP;
kern_return_t error;
struct thread_sched_info info;
unsigned int info_count=THREAD_SCHED_INFO_COUNT;
if (t == NULL)
return -1;
threadP = cthread_thread(t); /* get thread underlying */
error=thread_info(threadP, THREAD_SCHED_INFO,
(thread_info_t)&info, &info_count);
if (error != KERN_SUCCESS)
return -1;
if (base != NULL)
*base = info.base_priority;
return info.max_priority;
}
/* Backend initialization functions */
/* Initialize the threads subsystem. */
int
__objc_init_thread_system(void)
{
return 0;
}
/* Close the threads subsystem. */
int
__objc_close_thread_system(void)
{
return 0;
}
/* Backend thread functions */
/* Create a new thread of execution. */
objc_thread_t
__objc_thread_detach(void (*func)(void *arg), void *arg)
{
objc_thread_t thread_id;
cthread_t new_thread_handle;
/* create thread */
new_thread_handle = cthread_fork((cthread_fn_t)func, arg);
if(new_thread_handle)
{
/* this is not terribly portable */
thread_id = *(objc_thread_t *)&new_thread_handle;
cthread_detach(new_thread_handle);
}
else
thread_id = NULL;
return thread_id;
}
/* Set the current thread's priority. */
int
objc_thread_set_priority(int priority)
{
objc_thread_t *t = objc_thread_id();
cthread_t cT = (cthread_t) t;
int maxPriority = __mach_get_max_thread_priority(cT, NULL);
int sys_priority = 0;
if (maxPriority == -1)
return -1;
switch (priority)
{
case OBJC_THREAD_INTERACTIVE_PRIORITY:
sys_priority = maxPriority;
break;
case OBJC_THREAD_BACKGROUND_PRIORITY:
sys_priority = (maxPriority * 2) / 3;
break;
case OBJC_THREAD_LOW_PRIORITY:
sys_priority = maxPriority / 3;
break;
default:
return -1;
}
if (sys_priority == 0)
return -1;
/* Change the priority */
if (cthread_priority(cT, sys_priority, 0) == KERN_SUCCESS)
return 0;
else
return -1;
}
/* Return the current thread's priority. */
int
objc_thread_get_priority(void)
{
objc_thread_t *t = objc_thread_id();
cthread_t cT = (cthread_t) t; /* see objc_thread_id() */
int basePriority;
int maxPriority;
int sys_priority = 0;
int interactiveT, backgroundT, lowT; /* thresholds */
maxPriority = __mach_get_max_thread_priority(cT, &basePriority);
if(maxPriority == -1)
return -1;
if (basePriority > ( (maxPriority * 2) / 3))
return OBJC_THREAD_INTERACTIVE_PRIORITY;
if (basePriority > ( maxPriority / 3))
return OBJC_THREAD_BACKGROUND_PRIORITY;
return OBJC_THREAD_LOW_PRIORITY;
}
/* Yield our process time to another thread. */
void
objc_thread_yield(void)
{
cthread_yield();
}
/* Terminate the current thread. */
int
objc_thread_exit(void)
{
/* Decrement our counter of the number of threads alive */
objc_mutex_lock(__objc_runtime_mutex);
__objc_runtime_threads_alive--;
objc_mutex_unlock(__objc_runtime_mutex);
/* exit the thread */
cthread_exit(&__objc_thread_exit_status);
/* Failed if we reached here */
return -1;
}
/* Returns an integer value which uniquely describes a thread. */
objc_thread_t
objc_thread_id(void)
{
cthread_t self = cthread_self();
return *(objc_thread_t *)&self;
}
/* Sets the thread's local storage pointer. */
int
objc_thread_set_data(void *value)
{
cthread_set_data(cthread_self(), (any_t) value);
return 0;
}
/* Returns the thread's local storage pointer. */
void *
objc_thread_get_data(void)
{
return (void *) cthread_data(cthread_self());
}
/* Backend mutex functions */
/* Allocate a mutex. */
objc_mutex_t
objc_mutex_allocate(objc_mutex_t mutex)
{
int err = 0;
objc_mutex_t mutex;
/* Allocate the mutex structure */
if (!(mutex = (objc_mutex_t)objc_malloc(sizeof(struct objc_mutex))))
return NULL;
mutex->backend = objc_malloc(sizeof(struct mutex));
err = mutex_init((mutex_t)(mutex->backend));
if (err != 0)
{
objc_free(mutex->backend);
objc_free(mutex);
return NULL;
}
/* Initialize mutex */
mutex->owner = NULL;
mutex->depth = 0;
return mutex;
}
/* Deallocate a mutex. */
int
objc_mutex_deallocate(objc_mutex_t mutex)
{
int depth;
/* Valid mutex? */
if (!mutex)
return -1;
/* Acquire lock on mutex */
depth = objc_mutex_lock(mutex);
mutex_clear((mutex_t)(mutex->backend));
objc_free(mutex->backend);
mutex->backend = NULL;
/* Free the mutex structure */
objc_free(mutex);
/* Return last depth */
return depth;
}
/* Grab a lock on a mutex. */
int
objc_mutex_lock(objc_mutex_t mutex)
{
objc_thread_t thread_id;
/* Valid mutex? */
if (!mutex)
return -1;
/* If we already own the lock then increment depth */
thread_id = objc_thread_id();
if (mutex->owner == thread_id)
return ++mutex->depth;
mutex_lock((mutex_t)(mutex->backend));
/* Successfully locked the thread */
mutex->owner = thread_id;
return mutex->depth = 1;
}
/* Try to grab a lock on a mutex. */
int
objc_mutex_trylock(objc_mutex_t mutex)
{
objc_thread_t thread_id;
int status;
/* Valid mutex? */
if (!mutex)
return -1;
/* If we already own the lock then increment depth */
thread_id = objc_thread_id();
if (mutex->owner == thread_id)
return ++mutex->depth;
if (mutex_try_lock((mutex_t)(mutex->backend)) == 0)
status = -1;
else
status = 0;
/* Failed? */
if (status)
return status;
/* Successfully locked the thread */
mutex->owner = thread_id;
return mutex->depth = 1;
}
/* Unlock the mutex */
int
objc_mutex_unlock(objc_mutex_t mutex)
{
objc_thread_t thread_id;
/* Valid mutex? */
if (!mutex)
return -1;
/* If another thread owns the lock then abort */
thread_id = objc_thread_id();
if (mutex->owner != thread_id)
return -1;
/* Decrement depth and return */
if (mutex->depth > 1)
return --mutex->depth;
/* Depth down to zero so we are no longer the owner */
mutex->depth = 0;
mutex->owner = NULL;
mutex_unlock((mutex_t)(mutex->backend));
return 0;
}
/* Backend condition mutex functions */
/* Allocate a condition. */
objc_condition_t
objc_condition_allocate(void)
{
objc_condition_t condition;
/* Allocate the condition mutex structure */
if (!(condition =
(objc_condition_t)objc_malloc(sizeof(struct objc_condition))))
return NULL;
condition->backend = objc_malloc(sizeof(struct condition));
condition_init((condition_t)(condition->backend));
return condition;
}
/* Deallocate a condition. */
int
objc_condition_deallocate(objc_condition_t condition)
{
/* Broadcast the condition */
if (objc_condition_broadcast(condition))
return -1;
condition_clear((condition_t)(condition->backend));
objc_free(condition->backend);
condition->backend = NULL;
/* Free the condition mutex structure */
objc_free(condition);
return 0;
}
/* Wait on the condition */
int
objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
{
objc_thread_t thread_id;
/* Valid arguments? */
if (!mutex || !condition)
return -1;
/* Make sure we are owner of mutex */
thread_id = objc_thread_id();
if (mutex->owner != thread_id)
return -1;
/* Cannot be locked more than once */
if (mutex->depth > 1)
return -1;
/* Virtually unlock the mutex */
mutex->depth = 0;
mutex->owner = (objc_thread_t)NULL;
condition_wait((condition_t)(condition->backend),
(mutex_t)(mutex->backend));
/* Make ourselves owner of the mutex */
mutex->owner = thread_id;
mutex->depth = 1;
return 0;
}
/* Wake up all threads waiting on this condition. */
int
objc_condition_broadcast(objc_condition_t condition)
{
/* Valid condition mutex? */
if (!condition)
return -1;
condition_broadcast((condition_t)(condition->backend));
return 0;
}
/* Wake up one thread waiting on this condition. */
int
objc_condition_signal(objc_condition_t condition)
{
/* Valid condition mutex? */
if (!condition)
return -1;
condition_signal((condition_t)(condition->backend));
return 0;
}
/* Make the objc thread system aware that a thread which is managed
(started, stopped) by external code could access objc facilities
from now on. This is used when you are interfacing with some
external non-objc-based environment/system - you must call
objc_thread_add() before an alien thread makes any calls to
Objective-C. Do not cause the _objc_became_multi_threaded hook to
be executed. */
void
objc_thread_add(void)
{
objc_mutex_lock(__objc_runtime_mutex);
__objc_is_multi_threaded = 1;
__objc_runtime_threads_alive++;
objc_mutex_unlock(__objc_runtime_mutex);
}
/* Make the objc thread system aware that a thread managed (started,
stopped) by some external code will no longer access objc and thus
can be forgotten by the objc thread system. Call
objc_thread_remove() when your alien thread is done with making
calls to Objective-C. */
void
objc_thread_remove(void)
{
objc_mutex_lock(__objc_runtime_mutex);
__objc_runtime_threads_alive--;
objc_mutex_unlock(__objc_runtime_mutex);
}
/* End of File */