1 /* 2 Copyright (c) 2012, Broadcom Europe Ltd 3 All rights reserved. 4 5 Redistribution and use in source and binary forms, with or without 6 modification, are permitted provided that the following conditions are met: 7 * Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 * Redistributions in binary form must reproduce the above copyright 10 notice, this list of conditions and the following disclaimer in the 11 documentation and/or other materials provided with the distribution. 12 * Neither the name of the copyright holder nor the 13 names of its contributors may be used to endorse or promote products 14 derived from this software without specific prior written permission. 15 16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 17 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY 20 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #ifndef MMAL_VC_SHM_H 28 #define MMAL_VC_SHM_H 29 30 /** @file 31 * 32 * Abstraction layer for MMAL VC shared memory. 33 * This API is only used by the MMAL VC component. 34 */ 35 36 #include "mmal_types.h" 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /** Initialise the shared memory system */ 43 MMAL_STATUS_T mmal_vc_shm_init(void); 44 45 /** Release the shared memory system */ 46 void mmal_vc_shm_exit(void); 47 48 /** Allocate a shared memory buffer */ 49 uint8_t *mmal_vc_shm_alloc(uint32_t size); 50 51 /** Free a shared memory buffer */ 52 MMAL_STATUS_T mmal_vc_shm_free(uint8_t *mem); 53 54 /** Lock a shared memory buffer */ 55 uint8_t *mmal_vc_shm_lock(uint8_t *mem, uint32_t workaround); 56 57 /** Unlock a shared memory buffer */ 58 uint8_t *mmal_vc_shm_unlock(uint8_t *mem, uint32_t *length, uint32_t workaround); 59 60 61 #ifdef __cplusplus 62 } 63 #endif 64 65 #endif /* MMAL_VC_SHM_H */ 66