1 /* 2 * Dummy cpu thread code 3 * 4 * Copyright IBM, Corp. 2011 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/rcu.h" 16 #include "sysemu/cpus.h" 17 #include "qemu/guest-random.h" 18 #include "qemu/main-loop.h" 19 #include "hw/core/cpu.h" 20 21 static void *dummy_cpu_thread_fn(void *arg) 22 { 23 CPUState *cpu = arg; 24 25 rcu_register_thread(); 26 27 bql_lock(); 28 qemu_thread_get_self(cpu->thread); 29 cpu->thread_id = qemu_get_thread_id(); 30 current_cpu = cpu; 31 32 #ifndef _WIN32 33 sigset_t waitset; 34 int r; 35 36 sigemptyset(&waitset); 37 sigaddset(&waitset, SIG_IPI); 38 #endif 39 40 /* signal CPU creation */ 41 cpu_thread_signal_created(cpu); 42 qemu_guest_random_seed_thread_part2(cpu->random_seed); 43 44 do { 45 bql_unlock(); 46 #ifndef _WIN32 47 do { 48 int sig; 49 r = sigwait(&waitset, &sig); 50 } while (r == -1 && (errno == EAGAIN || errno == EINTR)); 51 if (r == -1) { 52 perror("sigwait"); 53 exit(1); 54 } 55 #else 56 qemu_sem_wait(&cpu->sem); 57 #endif 58 bql_lock(); 59 qemu_wait_io_event(cpu); 60 } while (!cpu->unplug); 61 62 bql_unlock(); 63 rcu_unregister_thread(); 64 return NULL; 65 } 66 67 void dummy_start_vcpu_thread(CPUState *cpu) 68 { 69 char thread_name[VCPU_THREAD_NAME_SIZE]; 70 71 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY", 72 cpu->cpu_index); 73 qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu, 74 QEMU_THREAD_JOINABLE); 75 #ifdef _WIN32 76 qemu_sem_init(&cpu->sem, 0); 77 #endif 78 } 79