230 lines
5.6 KiB
C
230 lines
5.6 KiB
C
/*
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* (c) Copyright 1990-1996 OPEN SOFTWARE FOUNDATION, INC.
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* (c) Copyright 1990-1996 HEWLETT-PACKARD COMPANY
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* (c) Copyright 1990-1996 DIGITAL EQUIPMENT CORPORATION
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* (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems
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* To anyone who acknowledges that this file is provided "AS IS" without
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* any express or implied warranty: permission to use, copy, modify, and
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* distribute this file for any purpose is hereby granted without fee,
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* provided that the above copyright notices and this notice appears in
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* all source code copies, and that none of the names listed above be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. None of these organizations
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* makes any representations about the suitability of this software for
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* any purpose.
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*/
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/*
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* Header file for mutex operations
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*/
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#ifndef CMA_MUTEX
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#define CMA_MUTEX
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/*
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* INCLUDE FILES
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*/
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#include <cma.h>
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#include <cma_attr.h>
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#include <cma_defs.h>
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#include <cma_semaphore_defs.h>
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#include <cma_sequence.h>
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#include <cma_tcb_defs.h>
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#include <cma_stack.h>
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/*
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* CONSTANTS AND MACROS
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*/
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/*
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* TYPEDEFS
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*/
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typedef struct CMA__T_INT_MUTEX {
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cma__t_object header; /* Common header (sequence, type) */
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cma__t_int_attr *attributes; /* Back link */
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cma__t_int_tcb *owner; /* Current owner (if any) */
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cma_t_integer nest_count; /* Nesting level for recursive mutex */
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cma__t_atomic_bit *unlock; /* Pointer used for unlock operation */
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cma__t_atomic_bit lock; /* Set if currently locked */
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struct CMA__T_INT_MUTEX *int_lock; /* Internal protection for mutex */
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cma__t_atomic_bit event; /* Clear when unlock requires action */
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cma__t_atomic_bit waiters; /* Clear when threads are waiting */
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cma__t_atomic_bit bitbucket; /* Fake bit to keep friendlies locked */
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cma_t_mutex_kind mutex_kind; /* Kind of mutex */
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cma__t_semaphore semaphore; /* Semaphore for low-level wait */
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} cma__t_int_mutex;
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/*
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* FUNCTIONAL DESCRIPTION:
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*
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* Lock a mutex (internal)
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*
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* FORMAL PARAMETERS:
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*
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* mutex Pointer to mutex object to lock
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*
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* IMPLICIT INPUTS:
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*
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* none
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*
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* IMPLICIT OUTPUTS:
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*
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* none
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*
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* FUNCTION VALUE:
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*
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* none
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*
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* SIDE EFFECTS:
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*
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* none
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*/
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#ifdef NDEBUG
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# define cma__int_lock(mutex) { \
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if (cma__test_and_set (&((cma__t_int_mutex *)mutex)->lock)) { \
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cma_t_status res;\
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res = cma__int_mutex_block ((cma__t_int_mutex *)mutex); \
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if (res != cma_s_normal) cma__error (res); \
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} \
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}
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#else
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# define cma__int_lock(mutex) { \
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cma__t_int_tcb *__ltcb__; \
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__ltcb__ = cma__get_self_tcb (); \
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if (cma__test_and_set (&((cma__t_int_mutex *)mutex)->lock)) { \
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cma_t_status res;\
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res = cma__int_mutex_block ((cma__t_int_mutex *)mutex); \
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if (res != cma_s_normal) cma__error (res); \
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} \
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((cma__t_int_mutex *)mutex)->owner = __ltcb__; \
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}
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#endif
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/*
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* FUNCTIONAL DESCRIPTION:
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*
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* Unlock a mutex (internal)
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*
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* FORMAL PARAMETERS:
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*
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* mutex Pointer to mutex object to unlock
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*
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* IMPLICIT INPUTS:
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*
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* none
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*
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* IMPLICIT OUTPUTS:
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*
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* none
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*
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* FUNCTION VALUE:
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*
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* none
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*
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* SIDE EFFECTS:
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*
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* none
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*/
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#ifdef NDEBUG
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# define cma__int_unlock(mutex) { \
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cma__unset (((cma__t_int_mutex *)mutex)->unlock); \
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if (!cma__test_and_set (&((cma__t_int_mutex *)mutex)->event)) { \
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cma_t_status res;\
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res = cma__int_mutex_unblock ((cma__t_int_mutex *)mutex); \
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if (res != cma_s_normal) cma__error (res); \
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} \
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}
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#else
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# define cma__int_unlock(mutex) { \
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cma__t_int_tcb *__utcb__; \
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__utcb__ = cma__get_self_tcb (); \
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if (((cma__t_int_mutex *)mutex)->mutex_kind == cma_c_mutex_fast) { \
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cma__assert_warn ( \
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(__utcb__ == ((cma__t_int_mutex *)mutex)->owner), \
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"attempt to release mutx owned by another thread"); \
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((cma__t_int_mutex *)mutex)->owner = (cma__t_int_tcb *)cma_c_null_ptr; \
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} \
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cma__unset (((cma__t_int_mutex *)mutex)->unlock); \
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if (!cma__test_and_set (&((cma__t_int_mutex *)mutex)->event)) { \
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cma_t_status res;\
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res = cma__int_mutex_unblock ((cma__t_int_mutex *)mutex); \
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if (res != cma_s_normal) cma__error (res); \
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} \
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}
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#endif
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/*
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* FUNCTIONAL DESCRIPTION:
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*
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* cma__int_mutex_delete - Performs work for cma_mutex_delete
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*
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* FORMAL PARAMETERS:
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*
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* cma__t_mutex _mutex_ - Mutex to be deleted
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*
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* IMPLICIT INPUTS:
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*
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* none
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*
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* IMPLICIT OUTPUTS:
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*
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* none
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*
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* FUNCTION VALUE:
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*
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* none
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*
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* SIDE EFFECTS:
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*
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* none
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*/
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#define cma__int_mutex_delete(_mutex_) { \
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cma__t_int_mutex *_int_mutex_; \
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_int_mutex_ = cma__validate_null_mutex (_mutex_); \
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if (_int_mutex_ == (cma__t_int_mutex *)cma_c_null_ptr) \
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return; \
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if (cma__int_mutex_locked (_int_mutex_)) \
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cma__error (cma_s_in_use); \
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cma__free_mutex (_int_mutex_); \
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cma__clear_handle (_mutex_); \
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}
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/*
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* GLOBAL DATA
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*/
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extern cma__t_sequence cma__g_mutex_seq;
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extern cma__t_int_mutex *cma__g_global_lock;
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/*
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* INTERNAL INTERFACES
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*/
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extern void cma__destroy_mutex (cma__t_int_mutex *);
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extern void cma__free_mutex (cma__t_int_mutex *);
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extern void cma__free_mutex_nolock (cma__t_int_mutex *);
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extern cma__t_int_mutex * cma__get_first_mutex (cma__t_int_attr *);
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extern cma__t_int_mutex * cma__get_mutex (cma__t_int_attr *);
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extern void cma__init_mutex (void);
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extern cma_t_status cma__int_mutex_block (cma__t_int_mutex *);
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extern cma_t_boolean cma__int_mutex_locked (cma__t_int_mutex *);
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extern cma_t_boolean cma__int_try_lock (cma__t_int_mutex *);
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extern cma_t_status cma__int_mutex_unblock (cma__t_int_mutex *);
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extern cma_t_boolean cma__mutex_locked (cma_t_mutex);
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extern void cma__reinit_mutex (cma_t_integer);
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#endif
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