intmain(){intrc =0;pthread_tchild_thread;#ifdefPTHREAD_PROCESS_PRIVATEpshared = PTHREAD_PROCESS_PRIVATE;#elsepshared =-1;#endifprintf("main: initialize spin lock\n"); rc =pthread_spin_init(&spinlock, pshared);if(rc !=0) {printf("Test FAILED: Error atpthread_spin_init()\n");return...