accel: move qtest CpusAccel functions to a common location
[qemu.git] / accel / dummy-cpus.c
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 sigset_t waitset;
25 int r;
26
27 rcu_register_thread();
28
29 qemu_mutex_lock_iothread();
30 qemu_thread_get_self(cpu->thread);
31 cpu->thread_id = qemu_get_thread_id();
32 cpu->can_do_io = 1;
33 current_cpu = cpu;
34
35 sigemptyset(&waitset);
36 sigaddset(&waitset, SIG_IPI);
37
38 /* signal CPU creation */
39 cpu_thread_signal_created(cpu);
40 qemu_guest_random_seed_thread_part2(cpu->random_seed);
41
42 do {
43 qemu_mutex_unlock_iothread();
44 do {
45 int sig;
46 r = sigwait(&waitset, &sig);
47 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
48 if (r == -1) {
49 perror("sigwait");
50 exit(1);
51 }
52 qemu_mutex_lock_iothread();
53 qemu_wait_io_event(cpu);
54 } while (!cpu->unplug);
55
56 qemu_mutex_unlock_iothread();
57 rcu_unregister_thread();
58 return NULL;
59 }
60
61 void dummy_start_vcpu_thread(CPUState *cpu)
62 {
63 char thread_name[VCPU_THREAD_NAME_SIZE];
64
65 cpu->thread = g_malloc0(sizeof(QemuThread));
66 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
67 qemu_cond_init(cpu->halt_cond);
68 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
69 cpu->cpu_index);
70 qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
71 QEMU_THREAD_JOINABLE);
72 }