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static inline int bip_request_read(uint32_t *off, uint32_t *size, struct bip *buffer){ printf("size=%u, read=%u, write=%u, reserved=%u\n",buffer->size, buffer->read , buffer->write, buffer->reserved); fflush(stdout); read_buffer_state(read, write, full_r2, buffer); printf("full_r2=%u\n",full_r2); fflush(stdout); if(full_r2){ uint32_t available = buffer->size - read; if(0 < available){ *size = MIN(*size, available); *off = read; }else if(0 < write){ // We are at the end and need to wrap now. //retry: printf("entering cas loop\n"); fflush(stdout); while(!atomic_cas(buffer->write, write_, write)){ printf("before atomic_read\n"); fflush(stdout); write_ = atomic_read(buffer->write); printf("after atomic_read\n"); fflush(stdout); write = write_ & 0x7FFFFFFF; // goto retry; } printf("out of cas loop\n"); fflush(stdout); // write = ( buffer->write & 0x7FFFFFFF); *size = MIN(*size, write); *off = 0; printf("before atomic_write\n"); fflush(stdout); atomic_write(buffer->read, 0); printf("after atomic_write\n"); fflush(stdout); //buffer->read=0; }else{ // Write has not done anything yet, no space! *size = 0; *off = 0; // fflush(stdout); printf("return 0, branch 1\n"); fflush(stdout); return 0; } }else if(read < write){ *size = MIN(*size, write-read); *off = read; }else{ *size = 0; *off = 0; //fflush(stdout); printf("return 0, branch 2\n"); fflush(stdout); return 0; } // fflush(stdout); printf("return 1\n"); fflush(stdout); return 1; }