2 * Dummy cpu thread code
4 * Copyright IBM, Corp. 2011
7 * Anthony Liguori <aliguori@us.ibm.com>
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.
14 #include "qemu/osdep.h"
16 #include "sysemu/cpus.h"
17 #include "qemu/guest-random.h"
18 #include "qemu/main-loop.h"
19 #include "hw/core/cpu.h"
21 static void *dummy_cpu_thread_fn(void *arg)
25 rcu_register_thread();
27 qemu_mutex_lock_iothread();
28 qemu_thread_get_self(cpu->thread);
29 cpu->thread_id = qemu_get_thread_id();
30 cpu->neg.can_do_io = true;
37 sigemptyset(&waitset);
38 sigaddset(&waitset, SIG_IPI);
41 /* signal CPU creation */
42 cpu_thread_signal_created(cpu);
43 qemu_guest_random_seed_thread_part2(cpu->random_seed);
46 qemu_mutex_unlock_iothread();
50 r = sigwait(&waitset, &sig);
51 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
57 qemu_sem_wait(&cpu->sem);
59 qemu_mutex_lock_iothread();
60 qemu_wait_io_event(cpu);
61 } while (!cpu->unplug);
63 qemu_mutex_unlock_iothread();
64 rcu_unregister_thread();
68 void dummy_start_vcpu_thread(CPUState *cpu)
70 char thread_name[VCPU_THREAD_NAME_SIZE];
72 cpu->thread = g_malloc0(sizeof(QemuThread));
73 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
74 qemu_cond_init(cpu->halt_cond);
75 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
77 qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
78 QEMU_THREAD_JOINABLE);
80 qemu_sem_init(&cpu->sem, 0);