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78 lines
3 KiB
C
78 lines
3 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_MAIN_LOOP_H
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#define QEMU_MAIN_LOOP_H 1
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#define SIG_IPI SIGUSR1
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struct uc_struct;
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/**
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* qemu_init_main_loop: Set up the process so that it can run the main loop.
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*
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* This includes setting up signal handlers. It should be called before
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* any other threads are created. In addition, threads other than the
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* main one should block signals that are trapped by the main loop.
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* For simplicity, you can consider these signals to be safe: SIGUSR1,
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* SIGUSR2, thread signals (SIGFPE, SIGILL, SIGSEGV, SIGBUS) and real-time
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* signals if available. Remember that Windows in practice does not have
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* signals, though.
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*
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* In the case of QEMU tools, this will also start/initialize timers.
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*/
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int qemu_init_main_loop(void);
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/**
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* qemu_mutex_lock_iothread: Lock the main loop mutex.
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*
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* This function locks the main loop mutex. The mutex is taken by
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* qemu_init_main_loop and always taken except while waiting on
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* external events (such as with select). The mutex should be taken
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* by threads other than the main loop thread when calling
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* qemu_bh_new(), qemu_set_fd_handler() and basically all other
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* functions documented in this file.
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*
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* NOTE: tools currently are single-threaded and qemu_mutex_lock_iothread
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* is a no-op there.
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*/
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void qemu_mutex_lock_iothread(struct uc_struct* uc);
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/**
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* qemu_mutex_unlock_iothread: Unlock the main loop mutex.
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*
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* This function unlocks the main loop mutex. The mutex is taken by
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* qemu_init_main_loop and always taken except while waiting on
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* external events (such as with select). The mutex should be unlocked
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* as soon as possible by threads other than the main loop thread,
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* because it prevents the main loop from processing callbacks,
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* including timers and bottom halves.
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*
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* NOTE: tools currently are single-threaded and qemu_mutex_unlock_iothread
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* is a no-op there.
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*/
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void qemu_mutex_unlock_iothread(struct uc_struct* uc);
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#endif
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