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 "system/cpus.h"
17 #include "qemu/guest-random.h"
18 #include "qemu/main-loop.h"
19 #include "hw/core/cpu.h"
20 #include "accel/dummy-cpus.h"
21
dummy_cpu_thread_fn(void * arg)22 static void *dummy_cpu_thread_fn(void *arg)
23 {
24 CPUState *cpu = arg;
25
26 rcu_register_thread();
27
28 bql_lock();
29 qemu_thread_get_self(cpu->thread);
30 cpu->thread_id = qemu_get_thread_id();
31 current_cpu = cpu;
32
33 #ifndef _WIN32
34 sigset_t waitset;
35 int r;
36
37 sigemptyset(&waitset);
38 sigaddset(&waitset, SIG_IPI);
39 #endif
40
41 /* signal CPU creation */
42 cpu_thread_signal_created(cpu);
43 qemu_guest_random_seed_thread_part2(cpu->random_seed);
44
45 do {
46 bql_unlock();
47 #ifndef _WIN32
48 do {
49 int sig;
50 r = sigwait(&waitset, &sig);
51 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
52 if (r == -1) {
53 perror("sigwait");
54 exit(1);
55 }
56 #else
57 qemu_sem_wait(&cpu->sem);
58 #endif
59 bql_lock();
60 qemu_wait_io_event(cpu);
61 } while (!cpu->unplug);
62
63 bql_unlock();
64 rcu_unregister_thread();
65 return NULL;
66 }
67
dummy_start_vcpu_thread(CPUState * cpu)68 void dummy_start_vcpu_thread(CPUState *cpu)
69 {
70 char thread_name[VCPU_THREAD_NAME_SIZE];
71
72 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
73 cpu->cpu_index);
74 qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
75 QEMU_THREAD_JOINABLE);
76 #ifdef _WIN32
77 qemu_sem_init(&cpu->sem, 0);
78 #endif
79 }
80