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Diffstat (limited to 'gcc/objc/thr-single.c')
| -rw-r--r-- | gcc/objc/thr-single.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/gcc/objc/thr-single.c b/gcc/objc/thr-single.c deleted file mode 100644 index 45b7b73fe2a..00000000000 --- a/gcc/objc/thr-single.c +++ /dev/null @@ -1,240 +0,0 @@ -/* GNU Objective C Runtime Thread Implementation - 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. - -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 <objc/thr.h> -#include "runtime.h" - -/******** - * This structure represents a single mutual exclusion lock. Lock semantics - * are detailed with the subsequent functions. We use whatever lock is - * provided by the system. We augment it with depth and current owner id - * fields to implement and re-entrant lock. - */ -struct objc_mutex -{ - volatile objc_thread_t owner; /* Id of thread that owns. */ - volatile int depth; /* # of acquires. */ -}; - -/******** - * Initialize the threads subsystem. Returns 0 if successful, or -1 if no - * thread support is available. - */ -int -__objc_init_thread_system(void) -{ - DEBUG_PRINTF("__objc_init_thread_system\n"); - return -1; /* Failed. */ -} - -/******** - * Create a new thread of execution and return its id. Return NULL if fails. - * The new thread starts in "func" with the given argument. - */ -objc_thread_t -objc_thread_create(void (*func)(void *arg), void *arg) -{ - return NULL; /* We can't start threads. */ -} - -/******** - * Set the current thread's priority. - */ -int -objc_thread_set_priority(int priority) -{ - return -1; /* Failed. */ -} - -/******** - * Return the current thread's priority. - */ -int -objc_thread_get_priority(void) -{ - return OBJC_THREAD_INTERACTIVE_PRIORITY; /* Highest priority. */ -} - -/******** - * Yield our process time to another thread. Any BUSY waiting that is done - * by a thread should use this function to make sure that other threads can - * make progress even on a lazy uniprocessor system. - */ -void -objc_thread_yield(void) -{ - return; -} - -/******** - * Terminate the current tread. Doesn't return anything. Doesn't return. - * Actually, if it failed returns -1. - */ -int -objc_thread_exit(void) -{ - exit(__objc_thread_exit_status); - return -1; -} - -/******** - * Returns an integer value which uniquely describes a thread. Must not be - * NULL which is reserved as a marker for "no thread". - */ -objc_thread_t -objc_thread_id(void) -{ - return (objc_thread_t)1; /* No thread support, use 1.*/ -} - -/******** - * Sets the thread's local storage pointer. Returns 0 if successful or -1 - * if failed. - */ - -static void *thread_local_storage = NULL; - -int -objc_thread_set_data(void *value) -{ - thread_local_storage = value; - return 0; -} - -/******** - * Returns the thread's local storage pointer. Returns NULL on failure. - */ -void * -objc_thread_get_data(void) -{ - return thread_local_storage; -} - -/******** - * Allocate a mutex. Return the mutex pointer if successful or NULL if the - * allocation failed for any reason. - */ -objc_mutex_t -objc_mutex_allocate(void) -{ - objc_mutex_t mutex; - - if (!(mutex = (objc_mutex_t)objc_malloc(sizeof(struct objc_mutex)))) - return NULL; /* Abort if malloc failed. */ - - mutex->owner = NULL; /* No owner. */ - mutex->depth = 0; /* No locks. */ - return mutex; /* Return mutex handle. */ -} - -/******** - * Deallocate a mutex. Note that this includes an implicit mutex_lock to - * insure that no one else is using the lock. It is legal to deallocate - * a lock if we have a lock on it, but illegal to deallocate a lock held - * by anyone else. - * Returns the number of locks on the thread. (1 for deallocate). - */ -int -objc_mutex_deallocate(objc_mutex_t mutex) -{ - int depth; /* # of locks on mutex. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - depth = objc_mutex_lock(mutex); /* Must have lock. */ - - objc_free(mutex); /* Free memory. */ - return depth; /* Return last depth. */ -} - -/******** - * Grab a lock on a mutex. If this thread already has a lock on this mutex - * then we increment the lock count. If another thread has a lock on the - * mutex we block and wait for the thread to release the lock. - * Returns the lock count on the mutex held by this thread. - */ -int -objc_mutex_lock(objc_mutex_t mutex) -{ - objc_thread_t thread_id; /* Cache our thread id. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner == thread_id) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ - - mutex->owner = thread_id; /* Mark thread as owner. */ - - return mutex->depth = 1; /* Increment depth to end. */ -} - -/******** - * Try to grab a lock on a mutex. If this thread already has a lock on - * this mutex then we increment the lock count and return it. If another - * thread has a lock on the mutex returns -1. - */ -int -objc_mutex_trylock(objc_mutex_t mutex) -{ - objc_thread_t thread_id; /* Cache our thread id. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner == thread_id) /* Already own lock? */ - return ++mutex->depth; /* Yes, increment depth. */ - - mutex->owner = thread_id; /* Mark thread as owner. */ - return mutex->depth = 1; /* Increment depth to end. */ -} - -/******** - * Decrements the lock count on this mutex by one. If the lock count reaches - * zero, release the lock on the mutex. Returns the lock count on the mutex. - * It is an error to attempt to unlock a mutex which this thread doesn't hold - * in which case return -1 and the mutex is unaffected. - * Will also return -1 if the mutex free fails. - */ -int -objc_mutex_unlock(objc_mutex_t mutex) -{ - objc_thread_t thread_id; /* Cache our thread id. */ - - if (!mutex) /* Is argument bad? */ - return -1; /* Yes, abort. */ - thread_id = objc_thread_id(); /* Get this thread's id. */ - if (mutex->owner != thread_id) /* Does some else own lock? */ - return -1; /* Yes, abort. */ - if (mutex->depth > 1) /* Released last lock? */ - return --mutex->depth; /* No, Decrement depth, end.*/ - mutex->depth = 0; /* Yes, reset depth to 0. */ - mutex->owner = NULL; /* Set owner to "no thread".*/ - - return 0; /* No, return success. */ -} - -/* End of File */ |