mirror of
https://gitlab.com/qemu-project/qemu
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a4c2735f35
Aside from the round robin threads this is all common code. By moving the halt_cond setup we also no longer need hacks to work around the race between QOM object creation and thread creation. It is a little ugly to free stuff up for the round robin thread but better it deal with its own specialises than making the other accelerators jump through hoops. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-ID: <20240530194250.1801701-3-alex.bennee@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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* Dummy cpu thread code
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/rcu.h"
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#include "sysemu/cpus.h"
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#include "qemu/guest-random.h"
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#include "qemu/main-loop.h"
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#include "hw/core/cpu.h"
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static void *dummy_cpu_thread_fn(void *arg)
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{
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CPUState *cpu = arg;
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rcu_register_thread();
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bql_lock();
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qemu_thread_get_self(cpu->thread);
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cpu->thread_id = qemu_get_thread_id();
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current_cpu = cpu;
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#ifndef _WIN32
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sigset_t waitset;
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int r;
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sigemptyset(&waitset);
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sigaddset(&waitset, SIG_IPI);
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#endif
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/* signal CPU creation */
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cpu_thread_signal_created(cpu);
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qemu_guest_random_seed_thread_part2(cpu->random_seed);
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do {
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bql_unlock();
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#ifndef _WIN32
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do {
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int sig;
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r = sigwait(&waitset, &sig);
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} while (r == -1 && (errno == EAGAIN || errno == EINTR));
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if (r == -1) {
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perror("sigwait");
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exit(1);
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}
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#else
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qemu_sem_wait(&cpu->sem);
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#endif
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bql_lock();
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qemu_wait_io_event(cpu);
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} while (!cpu->unplug);
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bql_unlock();
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rcu_unregister_thread();
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return NULL;
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}
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void dummy_start_vcpu_thread(CPUState *cpu)
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{
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char thread_name[VCPU_THREAD_NAME_SIZE];
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snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
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cpu->cpu_index);
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qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
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QEMU_THREAD_JOINABLE);
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#ifdef _WIN32
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qemu_sem_init(&cpu->sem, 0);
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#endif
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}
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