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#ifndef CYGONCE_SEMAPHORE_H #define CYGONCE_SEMAPHORE_H //============================================================================= // // semaphore.h // // POSIX semaphore header // //============================================================================= //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos 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. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //============================================================================= //#####DESCRIPTIONBEGIN#### // // Author(s): nickg // Contributors: nickg // Date: 2000-03-17 // Purpose: POSIX semaphore header // Description: This header contains all the definitions needed to support // semaphores under eCos. The reader is referred to the POSIX // standard or equivalent documentation for details of the // functionality contained herein. // // Usage: // #include <semaphore.h> // ... // // //####DESCRIPTIONEND#### // //============================================================================= #include <pkgconf/hal.h> #include <pkgconf/kernel.h> #include <pkgconf/posix.h> #include <stddef.h> // NULL, size_t #include <limits.h> #include <sys/types.h> //----------------------------------------------------------------------------- // Semaphore object definition // This structure must exactly correspond in size and layout to the underlying // eCos C++ class that implements this object. typedef struct { CYG_WORD32 sem_value; CYG_ADDRESS sem_queue; } sem_t; //----------------------------------------------------------------------------- // Semaphore functions // Initialize semaphore to value. // pshared is not supported under eCos. externC int sem_init (sem_t *sem, int pshared, unsigned int value); // Destroy the semaphore. externC int sem_destroy (sem_t *sem); // Decrement value if >0 or wait for a post. externC int sem_wait (sem_t *sem); // Decrement value if >0, return -1 if not. externC int sem_trywait (sem_t *sem); // Increment value and wake a waiter if one is present. externC int sem_post (sem_t *sem); // Get current value externC int sem_getvalue (sem_t *sem, int *sval); //----------------------------------------------------------------------------- // Named semaphore functions // These are an optional feature under eCos // Open an existing named semaphore, or create it. externC sem_t *sem_open (const char *name, int oflag, ...); // Close descriptor for semaphore. externC int sem_close (sem_t *sem); // Remove named semaphore externC int sem_unlink (const char *name); //----------------------------------------------------------------------------- // Special return value for sem_open() #define SEM_FAILED ((sem_t *)NULL) //----------------------------------------------------------------------------- #endif // ifndef CYGONCE_SEMAPHORE_H // End of semaphore.h
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