84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* CPU thread main loop - common bits for user and system mode emulation
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "exec/cpu-common.h"
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#include "qom/cpu.h"
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#include "sysemu/cpus.h"
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static QemuMutex qemu_cpu_list_lock;
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void qemu_init_cpu_list(void)
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{
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qemu_mutex_init(&qemu_cpu_list_lock);
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}
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void cpu_list_lock(void)
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{
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qemu_mutex_lock(&qemu_cpu_list_lock);
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}
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void cpu_list_unlock(void)
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{
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qemu_mutex_unlock(&qemu_cpu_list_lock);
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}
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static bool cpu_index_auto_assigned;
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static int cpu_get_free_index(void)
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{
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CPUState *some_cpu;
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int cpu_index = 0;
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cpu_index_auto_assigned = true;
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CPU_FOREACH(some_cpu) {
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cpu_index++;
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}
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return cpu_index;
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}
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void cpu_list_add(CPUState *cpu)
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{
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qemu_mutex_lock(&qemu_cpu_list_lock);
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if (cpu->cpu_index == UNASSIGNED_CPU_INDEX) {
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cpu->cpu_index = cpu_get_free_index();
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assert(cpu->cpu_index != UNASSIGNED_CPU_INDEX);
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} else {
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assert(!cpu_index_auto_assigned);
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}
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QTAILQ_INSERT_TAIL(&cpus, cpu, node);
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qemu_mutex_unlock(&qemu_cpu_list_lock);
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}
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void cpu_list_remove(CPUState *cpu)
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{
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qemu_mutex_lock(&qemu_cpu_list_lock);
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if (!QTAILQ_IN_USE(cpu, node)) {
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/* there is nothing to undo since cpu_exec_init() hasn't been called */
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qemu_mutex_unlock(&qemu_cpu_list_lock);
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return;
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}
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assert(!(cpu_index_auto_assigned && cpu != QTAILQ_LAST(&cpus, CPUTailQ)));
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QTAILQ_REMOVE(&cpus, cpu, node);
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cpu->cpu_index = UNASSIGNED_CPU_INDEX;
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qemu_mutex_unlock(&qemu_cpu_list_lock);
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}
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