getShareMemory(char *address, int size, int offset) hinzufuegen, ob man es braucht.
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@ -61,10 +61,27 @@ void writeSharedMemory(char *data, int size, int offset) {
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return;
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/* we could return -1, not sure if it will be useful to continue after there is no shm allocated for any reason*/
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} else {
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std::cout << "writing" << std::endl;
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char *shm_pointer = (char *) shmat(shmId, NULL, 0);
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semaphoreOperation(LOCK);
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memcpy(shm_pointer + offset, data, size);
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shmdt(shm_pointer); //close shm_pointer
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semaphoreOperation(UNLOCK);
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std::cout << "writing successed" << std::endl;
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}
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}
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void getSharedMemory(char *address, int size, int offset) {
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int shmId = shmget(impl.sharedMemoryKey, NULL, 0);
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if(shmId < 0) {
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return;
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} else {
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char *shm_pointer = (char *) shmat(shmId, NULL, 0);
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semaphoreOperation(LOCK);
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memcpy(address, shm_pointer + offset, size);
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shmdt(shm_pointer); //close shm_pointer
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semaphoreOperation(UNLOCK);
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return;
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}
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}
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@ -12,6 +12,15 @@
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*/
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char *getSharedMemory();
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/**
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* use lock and unlock when writing,
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* set content to the address
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* @param *address target address
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* @param size of data
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* @param offset where the data is written on the shared memory
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*/
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void getSharedMemory(char *address, int size, int offset);
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/**
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*
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* @return the size of the shared memory
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@ -24,10 +33,10 @@ void unlockSharedMemory();
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/**
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*
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* @param data poiter to data
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* @param data pointer to data
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* @param size of data
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* @param offset where the data is written on the shared memory
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*/
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void writeSharedMemory(char *data, int size, int offset);
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void writeSharedMemory(char *date, int size, int offset);
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#endif //LIBRARY_SHAREDMEMORYACCESSS_H
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