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1 | 44a9b356 | Paolo Bonzini | /*
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2 | 44a9b356 | Paolo Bonzini | * QEMU System Emulator
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3 | 44a9b356 | Paolo Bonzini | *
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4 | 44a9b356 | Paolo Bonzini | * Copyright (c) 2003-2008 Fabrice Bellard
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5 | 44a9b356 | Paolo Bonzini | *
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6 | 44a9b356 | Paolo Bonzini | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 44a9b356 | Paolo Bonzini | * of this software and associated documentation files (the "Software"), to deal
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8 | 44a9b356 | Paolo Bonzini | * in the Software without restriction, including without limitation the rights
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9 | 44a9b356 | Paolo Bonzini | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 44a9b356 | Paolo Bonzini | * copies of the Software, and to permit persons to whom the Software is
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11 | 44a9b356 | Paolo Bonzini | * furnished to do so, subject to the following conditions:
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12 | 44a9b356 | Paolo Bonzini | *
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13 | 44a9b356 | Paolo Bonzini | * The above copyright notice and this permission notice shall be included in
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14 | 44a9b356 | Paolo Bonzini | * all copies or substantial portions of the Software.
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15 | 44a9b356 | Paolo Bonzini | *
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16 | 44a9b356 | Paolo Bonzini | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 44a9b356 | Paolo Bonzini | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 44a9b356 | Paolo Bonzini | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 44a9b356 | Paolo Bonzini | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 44a9b356 | Paolo Bonzini | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 44a9b356 | Paolo Bonzini | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 44a9b356 | Paolo Bonzini | * THE SOFTWARE.
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23 | 44a9b356 | Paolo Bonzini | */
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24 | 44a9b356 | Paolo Bonzini | |
25 | 44a9b356 | Paolo Bonzini | #ifndef QEMU_MAIN_LOOP_H
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26 | 44a9b356 | Paolo Bonzini | #define QEMU_MAIN_LOOP_H 1 |
27 | 44a9b356 | Paolo Bonzini | |
28 | f627aab1 | Paolo Bonzini | #include "qemu-aio.h" |
29 | f627aab1 | Paolo Bonzini | |
30 | 44a9b356 | Paolo Bonzini | #define SIG_IPI SIGUSR1
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31 | 44a9b356 | Paolo Bonzini | |
32 | 44a9b356 | Paolo Bonzini | /**
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33 | 44a9b356 | Paolo Bonzini | * qemu_init_main_loop: Set up the process so that it can run the main loop.
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34 | 44a9b356 | Paolo Bonzini | *
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35 | 44a9b356 | Paolo Bonzini | * This includes setting up signal handlers. It should be called before
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36 | 44a9b356 | Paolo Bonzini | * any other threads are created. In addition, threads other than the
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37 | 44a9b356 | Paolo Bonzini | * main one should block signals that are trapped by the main loop.
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38 | 44a9b356 | Paolo Bonzini | * For simplicity, you can consider these signals to be safe: SIGUSR1,
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39 | 44a9b356 | Paolo Bonzini | * SIGUSR2, thread signals (SIGFPE, SIGILL, SIGSEGV, SIGBUS) and real-time
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40 | 44a9b356 | Paolo Bonzini | * signals if available. Remember that Windows in practice does not have
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41 | 44a9b356 | Paolo Bonzini | * signals, though.
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42 | d34e8f6e | Michael Roth | *
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43 | d34e8f6e | Michael Roth | * In the case of QEMU tools, this will also start/initialize timers.
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44 | 44a9b356 | Paolo Bonzini | */
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45 | 44a9b356 | Paolo Bonzini | int qemu_init_main_loop(void); |
46 | 44a9b356 | Paolo Bonzini | |
47 | 44a9b356 | Paolo Bonzini | /**
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48 | 44a9b356 | Paolo Bonzini | * main_loop_wait: Run one iteration of the main loop.
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49 | 44a9b356 | Paolo Bonzini | *
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50 | 44a9b356 | Paolo Bonzini | * If @nonblocking is true, poll for events, otherwise suspend until
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51 | 44a9b356 | Paolo Bonzini | * one actually occurs. The main loop usually consists of a loop that
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52 | 44a9b356 | Paolo Bonzini | * repeatedly calls main_loop_wait(false).
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53 | 44a9b356 | Paolo Bonzini | *
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54 | 44a9b356 | Paolo Bonzini | * Main loop services include file descriptor callbacks, bottom halves
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55 | 44a9b356 | Paolo Bonzini | * and timers (defined in qemu-timer.h). Bottom halves are similar to timers
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56 | 44a9b356 | Paolo Bonzini | * that execute immediately, but have a lower overhead and scheduling them
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57 | 44a9b356 | Paolo Bonzini | * is wait-free, thread-safe and signal-safe.
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58 | 44a9b356 | Paolo Bonzini | *
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59 | 44a9b356 | Paolo Bonzini | * It is sometimes useful to put a whole program in a coroutine. In this
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60 | 44a9b356 | Paolo Bonzini | * case, the coroutine actually should be started from within the main loop,
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61 | 44a9b356 | Paolo Bonzini | * so that the main loop can run whenever the coroutine yields. To do this,
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62 | 44a9b356 | Paolo Bonzini | * you can use a bottom half to enter the coroutine as soon as the main loop
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63 | 44a9b356 | Paolo Bonzini | * starts:
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64 | 44a9b356 | Paolo Bonzini | *
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65 | 44a9b356 | Paolo Bonzini | * void enter_co_bh(void *opaque) {
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66 | 44a9b356 | Paolo Bonzini | * QEMUCoroutine *co = opaque;
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67 | 44a9b356 | Paolo Bonzini | * qemu_coroutine_enter(co, NULL);
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68 | 44a9b356 | Paolo Bonzini | * }
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69 | 44a9b356 | Paolo Bonzini | *
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70 | 44a9b356 | Paolo Bonzini | * ...
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71 | 44a9b356 | Paolo Bonzini | * QEMUCoroutine *co = qemu_coroutine_create(coroutine_entry);
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72 | 44a9b356 | Paolo Bonzini | * QEMUBH *start_bh = qemu_bh_new(enter_co_bh, co);
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73 | 44a9b356 | Paolo Bonzini | * qemu_bh_schedule(start_bh);
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74 | 44a9b356 | Paolo Bonzini | * while (...) {
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75 | 44a9b356 | Paolo Bonzini | * main_loop_wait(false);
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76 | 44a9b356 | Paolo Bonzini | * }
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77 | 44a9b356 | Paolo Bonzini | *
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78 | 44a9b356 | Paolo Bonzini | * (In the future we may provide a wrapper for this).
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79 | 44a9b356 | Paolo Bonzini | *
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80 | 44a9b356 | Paolo Bonzini | * @nonblocking: Whether the caller should block until an event occurs.
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81 | 44a9b356 | Paolo Bonzini | */
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82 | 44a9b356 | Paolo Bonzini | int main_loop_wait(int nonblocking); |
83 | 44a9b356 | Paolo Bonzini | |
84 | 44a9b356 | Paolo Bonzini | /**
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85 | 44a9b356 | Paolo Bonzini | * qemu_notify_event: Force processing of pending events.
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86 | 44a9b356 | Paolo Bonzini | *
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87 | 44a9b356 | Paolo Bonzini | * Similar to signaling a condition variable, qemu_notify_event forces
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88 | 44a9b356 | Paolo Bonzini | * main_loop_wait to look at pending events and exit. The caller of
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89 | 44a9b356 | Paolo Bonzini | * main_loop_wait will usually call it again very soon, so qemu_notify_event
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90 | 44a9b356 | Paolo Bonzini | * also has the side effect of recalculating the sets of file descriptors
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91 | 44a9b356 | Paolo Bonzini | * that the main loop waits for.
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92 | 44a9b356 | Paolo Bonzini | *
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93 | 44a9b356 | Paolo Bonzini | * Calling qemu_notify_event is rarely necessary, because main loop
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94 | 44a9b356 | Paolo Bonzini | * services (bottom halves and timers) call it themselves. One notable
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95 | 44a9b356 | Paolo Bonzini | * exception occurs when using qemu_set_fd_handler2 (see below).
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96 | 44a9b356 | Paolo Bonzini | */
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97 | 44a9b356 | Paolo Bonzini | void qemu_notify_event(void); |
98 | 44a9b356 | Paolo Bonzini | |
99 | 44a9b356 | Paolo Bonzini | #ifdef _WIN32
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100 | 44a9b356 | Paolo Bonzini | /* return TRUE if no sleep should be done afterwards */
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101 | 44a9b356 | Paolo Bonzini | typedef int PollingFunc(void *opaque); |
102 | 44a9b356 | Paolo Bonzini | |
103 | 44a9b356 | Paolo Bonzini | /**
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104 | 44a9b356 | Paolo Bonzini | * qemu_add_polling_cb: Register a Windows-specific polling callback
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105 | 44a9b356 | Paolo Bonzini | *
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106 | 44a9b356 | Paolo Bonzini | * Currently, under Windows some events are polled rather than waited for.
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107 | 44a9b356 | Paolo Bonzini | * Polling callbacks do not ensure that @func is called timely, because
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108 | 44a9b356 | Paolo Bonzini | * the main loop might wait for an arbitrarily long time. If possible,
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109 | 44a9b356 | Paolo Bonzini | * you should instead create a separate thread that does a blocking poll
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110 | 44a9b356 | Paolo Bonzini | * and set a Win32 event object. The event can then be passed to
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111 | 44a9b356 | Paolo Bonzini | * qemu_add_wait_object.
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112 | 44a9b356 | Paolo Bonzini | *
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113 | 44a9b356 | Paolo Bonzini | * Polling callbacks really have nothing Windows specific in them, but
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114 | 07f35073 | Dong Xu Wang | * as they are a hack and are currently not necessary under POSIX systems,
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115 | 44a9b356 | Paolo Bonzini | * they are only available when QEMU is running under Windows.
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116 | 44a9b356 | Paolo Bonzini | *
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117 | 44a9b356 | Paolo Bonzini | * @func: The function that does the polling, and returns 1 to force
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118 | 44a9b356 | Paolo Bonzini | * immediate completion of main_loop_wait.
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119 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-size value that is passed to @func.
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120 | 44a9b356 | Paolo Bonzini | */
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121 | 44a9b356 | Paolo Bonzini | int qemu_add_polling_cb(PollingFunc *func, void *opaque); |
122 | 44a9b356 | Paolo Bonzini | |
123 | 44a9b356 | Paolo Bonzini | /**
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124 | 44a9b356 | Paolo Bonzini | * qemu_del_polling_cb: Unregister a Windows-specific polling callback
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125 | 44a9b356 | Paolo Bonzini | *
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126 | 44a9b356 | Paolo Bonzini | * This function removes a callback that was registered with
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127 | 44a9b356 | Paolo Bonzini | * qemu_add_polling_cb.
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128 | 44a9b356 | Paolo Bonzini | *
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129 | 44a9b356 | Paolo Bonzini | * @func: The function that was passed to qemu_add_polling_cb.
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130 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-size value that was passed to qemu_add_polling_cb.
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131 | 44a9b356 | Paolo Bonzini | */
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132 | 44a9b356 | Paolo Bonzini | void qemu_del_polling_cb(PollingFunc *func, void *opaque); |
133 | 44a9b356 | Paolo Bonzini | |
134 | 44a9b356 | Paolo Bonzini | /* Wait objects handling */
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135 | 44a9b356 | Paolo Bonzini | typedef void WaitObjectFunc(void *opaque); |
136 | 44a9b356 | Paolo Bonzini | |
137 | 44a9b356 | Paolo Bonzini | /**
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138 | 44a9b356 | Paolo Bonzini | * qemu_add_wait_object: Register a callback for a Windows handle
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139 | 44a9b356 | Paolo Bonzini | *
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140 | 44a9b356 | Paolo Bonzini | * Under Windows, the iohandler mechanism can only be used with sockets.
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141 | 44a9b356 | Paolo Bonzini | * QEMU must use the WaitForMultipleObjects API to wait on other handles.
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142 | 44a9b356 | Paolo Bonzini | * This function registers a #HANDLE with QEMU, so that it will be included
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143 | 44a9b356 | Paolo Bonzini | * in the main loop's calls to WaitForMultipleObjects. When the handle
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144 | 44a9b356 | Paolo Bonzini | * is in a signaled state, QEMU will call @func.
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145 | 44a9b356 | Paolo Bonzini | *
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146 | 44a9b356 | Paolo Bonzini | * @handle: The Windows handle to be observed.
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147 | 44a9b356 | Paolo Bonzini | * @func: A function to be called when @handle is in a signaled state.
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148 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-size value that is passed to @func.
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149 | 44a9b356 | Paolo Bonzini | */
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150 | 44a9b356 | Paolo Bonzini | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque); |
151 | 44a9b356 | Paolo Bonzini | |
152 | 44a9b356 | Paolo Bonzini | /**
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153 | 44a9b356 | Paolo Bonzini | * qemu_del_wait_object: Unregister a callback for a Windows handle
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154 | 44a9b356 | Paolo Bonzini | *
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155 | 44a9b356 | Paolo Bonzini | * This function removes a callback that was registered with
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156 | 44a9b356 | Paolo Bonzini | * qemu_add_wait_object.
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157 | 44a9b356 | Paolo Bonzini | *
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158 | 44a9b356 | Paolo Bonzini | * @func: The function that was passed to qemu_add_wait_object.
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159 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-size value that was passed to qemu_add_wait_object.
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160 | 44a9b356 | Paolo Bonzini | */
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161 | 44a9b356 | Paolo Bonzini | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque); |
162 | 44a9b356 | Paolo Bonzini | #endif
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163 | 44a9b356 | Paolo Bonzini | |
164 | 44a9b356 | Paolo Bonzini | /* async I/O support */
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165 | 44a9b356 | Paolo Bonzini | |
166 | 44a9b356 | Paolo Bonzini | typedef void IOReadHandler(void *opaque, const uint8_t *buf, int size); |
167 | 44a9b356 | Paolo Bonzini | typedef int IOCanReadHandler(void *opaque); |
168 | 44a9b356 | Paolo Bonzini | |
169 | 44a9b356 | Paolo Bonzini | /**
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170 | 44a9b356 | Paolo Bonzini | * qemu_set_fd_handler2: Register a file descriptor with the main loop
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171 | 44a9b356 | Paolo Bonzini | *
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172 | 44a9b356 | Paolo Bonzini | * This function tells the main loop to wake up whenever one of the
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173 | 44a9b356 | Paolo Bonzini | * following conditions is true:
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174 | 44a9b356 | Paolo Bonzini | *
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175 | 44a9b356 | Paolo Bonzini | * 1) if @fd_write is not %NULL, when the file descriptor is writable;
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176 | 44a9b356 | Paolo Bonzini | *
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177 | 44a9b356 | Paolo Bonzini | * 2) if @fd_read is not %NULL, when the file descriptor is readable.
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178 | 44a9b356 | Paolo Bonzini | *
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179 | 44a9b356 | Paolo Bonzini | * @fd_read_poll can be used to disable the @fd_read callback temporarily.
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180 | 44a9b356 | Paolo Bonzini | * This is useful to avoid calling qemu_set_fd_handler2 every time the
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181 | 44a9b356 | Paolo Bonzini | * client becomes interested in reading (or dually, stops being interested).
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182 | 44a9b356 | Paolo Bonzini | * A typical example is when @fd is a listening socket and you want to bound
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183 | 44a9b356 | Paolo Bonzini | * the number of active clients. Remember to call qemu_notify_event whenever
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184 | 44a9b356 | Paolo Bonzini | * the condition may change from %false to %true.
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185 | 44a9b356 | Paolo Bonzini | *
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186 | 44a9b356 | Paolo Bonzini | * The callbacks that are set up by qemu_set_fd_handler2 are level-triggered.
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187 | 44a9b356 | Paolo Bonzini | * If @fd_read does not read from @fd, or @fd_write does not write to @fd
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188 | 44a9b356 | Paolo Bonzini | * until its buffers are full, they will be called again on the next
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189 | 44a9b356 | Paolo Bonzini | * iteration.
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190 | 44a9b356 | Paolo Bonzini | *
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191 | 44a9b356 | Paolo Bonzini | * @fd: The file descriptor to be observed. Under Windows it must be
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192 | 44a9b356 | Paolo Bonzini | * a #SOCKET.
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193 | 44a9b356 | Paolo Bonzini | *
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194 | 44a9b356 | Paolo Bonzini | * @fd_read_poll: A function that returns 1 if the @fd_read callback
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195 | 44a9b356 | Paolo Bonzini | * should be fired. If the function returns 0, the main loop will not
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196 | 44a9b356 | Paolo Bonzini | * end its iteration even if @fd becomes readable.
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197 | 44a9b356 | Paolo Bonzini | *
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198 | 44a9b356 | Paolo Bonzini | * @fd_read: A level-triggered callback that is fired if @fd is readable
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199 | 44a9b356 | Paolo Bonzini | * at the beginning of a main loop iteration, or if it becomes readable
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200 | 44a9b356 | Paolo Bonzini | * during one.
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201 | 44a9b356 | Paolo Bonzini | *
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202 | 44a9b356 | Paolo Bonzini | * @fd_write: A level-triggered callback that is fired when @fd is writable
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203 | 44a9b356 | Paolo Bonzini | * at the beginning of a main loop iteration, or if it becomes writable
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204 | 44a9b356 | Paolo Bonzini | * during one.
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205 | 44a9b356 | Paolo Bonzini | *
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206 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-sized value that is passed to @fd_read_poll,
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207 | 44a9b356 | Paolo Bonzini | * @fd_read and @fd_write.
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208 | 44a9b356 | Paolo Bonzini | */
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209 | 44a9b356 | Paolo Bonzini | int qemu_set_fd_handler2(int fd, |
210 | 44a9b356 | Paolo Bonzini | IOCanReadHandler *fd_read_poll, |
211 | 44a9b356 | Paolo Bonzini | IOHandler *fd_read, |
212 | 44a9b356 | Paolo Bonzini | IOHandler *fd_write, |
213 | 44a9b356 | Paolo Bonzini | void *opaque);
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214 | 44a9b356 | Paolo Bonzini | |
215 | 44a9b356 | Paolo Bonzini | /**
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216 | 44a9b356 | Paolo Bonzini | * qemu_set_fd_handler: Register a file descriptor with the main loop
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217 | 44a9b356 | Paolo Bonzini | *
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218 | 44a9b356 | Paolo Bonzini | * This function tells the main loop to wake up whenever one of the
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219 | 44a9b356 | Paolo Bonzini | * following conditions is true:
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220 | 44a9b356 | Paolo Bonzini | *
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221 | 44a9b356 | Paolo Bonzini | * 1) if @fd_write is not %NULL, when the file descriptor is writable;
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222 | 44a9b356 | Paolo Bonzini | *
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223 | 44a9b356 | Paolo Bonzini | * 2) if @fd_read is not %NULL, when the file descriptor is readable.
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224 | 44a9b356 | Paolo Bonzini | *
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225 | 44a9b356 | Paolo Bonzini | * The callbacks that are set up by qemu_set_fd_handler are level-triggered.
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226 | 44a9b356 | Paolo Bonzini | * If @fd_read does not read from @fd, or @fd_write does not write to @fd
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227 | 44a9b356 | Paolo Bonzini | * until its buffers are full, they will be called again on the next
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228 | 44a9b356 | Paolo Bonzini | * iteration.
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229 | 44a9b356 | Paolo Bonzini | *
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230 | 44a9b356 | Paolo Bonzini | * @fd: The file descriptor to be observed. Under Windows it must be
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231 | 44a9b356 | Paolo Bonzini | * a #SOCKET.
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232 | 44a9b356 | Paolo Bonzini | *
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233 | 44a9b356 | Paolo Bonzini | * @fd_read: A level-triggered callback that is fired if @fd is readable
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234 | 44a9b356 | Paolo Bonzini | * at the beginning of a main loop iteration, or if it becomes readable
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235 | 44a9b356 | Paolo Bonzini | * during one.
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236 | 44a9b356 | Paolo Bonzini | *
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237 | 44a9b356 | Paolo Bonzini | * @fd_write: A level-triggered callback that is fired when @fd is writable
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238 | 44a9b356 | Paolo Bonzini | * at the beginning of a main loop iteration, or if it becomes writable
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239 | 44a9b356 | Paolo Bonzini | * during one.
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240 | 44a9b356 | Paolo Bonzini | *
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241 | 44a9b356 | Paolo Bonzini | * @opaque: A pointer-sized value that is passed to @fd_read and @fd_write.
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242 | 44a9b356 | Paolo Bonzini | */
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243 | 44a9b356 | Paolo Bonzini | int qemu_set_fd_handler(int fd, |
244 | 44a9b356 | Paolo Bonzini | IOHandler *fd_read, |
245 | 44a9b356 | Paolo Bonzini | IOHandler *fd_write, |
246 | 44a9b356 | Paolo Bonzini | void *opaque);
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247 | 44a9b356 | Paolo Bonzini | |
248 | 44a9b356 | Paolo Bonzini | #ifdef CONFIG_POSIX
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249 | 44a9b356 | Paolo Bonzini | /**
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250 | 44a9b356 | Paolo Bonzini | * qemu_add_child_watch: Register a child process for reaping.
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251 | 44a9b356 | Paolo Bonzini | *
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252 | 44a9b356 | Paolo Bonzini | * Under POSIX systems, a parent process must read the exit status of
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253 | 44a9b356 | Paolo Bonzini | * its child processes using waitpid, or the operating system will not
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254 | 44a9b356 | Paolo Bonzini | * free some of the resources attached to that process.
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255 | 44a9b356 | Paolo Bonzini | *
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256 | 44a9b356 | Paolo Bonzini | * This function directs the QEMU main loop to observe a child process
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257 | 44a9b356 | Paolo Bonzini | * and call waitpid as soon as it exits; the watch is then removed
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258 | 44a9b356 | Paolo Bonzini | * automatically. It is useful whenever QEMU forks a child process
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259 | 44a9b356 | Paolo Bonzini | * but will find out about its termination by other means such as a
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260 | 44a9b356 | Paolo Bonzini | * "broken pipe".
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261 | 44a9b356 | Paolo Bonzini | *
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262 | 44a9b356 | Paolo Bonzini | * @pid: The pid that QEMU should observe.
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263 | 44a9b356 | Paolo Bonzini | */
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264 | 44a9b356 | Paolo Bonzini | int qemu_add_child_watch(pid_t pid);
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265 | 44a9b356 | Paolo Bonzini | #endif
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266 | 44a9b356 | Paolo Bonzini | |
267 | d3b12f5d | Paolo Bonzini | /**
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268 | d3b12f5d | Paolo Bonzini | * qemu_mutex_lock_iothread: Lock the main loop mutex.
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269 | d3b12f5d | Paolo Bonzini | *
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270 | d3b12f5d | Paolo Bonzini | * This function locks the main loop mutex. The mutex is taken by
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271 | d3b12f5d | Paolo Bonzini | * qemu_init_main_loop and always taken except while waiting on
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272 | d3b12f5d | Paolo Bonzini | * external events (such as with select). The mutex should be taken
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273 | d3b12f5d | Paolo Bonzini | * by threads other than the main loop thread when calling
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274 | d3b12f5d | Paolo Bonzini | * qemu_bh_new(), qemu_set_fd_handler() and basically all other
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275 | d3b12f5d | Paolo Bonzini | * functions documented in this file.
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276 | cbcfa041 | Paolo Bonzini | *
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277 | cbcfa041 | Paolo Bonzini | * NOTE: tools currently are single-threaded and qemu_mutex_lock_iothread
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278 | cbcfa041 | Paolo Bonzini | * is a no-op there.
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279 | d3b12f5d | Paolo Bonzini | */
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280 | d3b12f5d | Paolo Bonzini | void qemu_mutex_lock_iothread(void); |
281 | d3b12f5d | Paolo Bonzini | |
282 | d3b12f5d | Paolo Bonzini | /**
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283 | d3b12f5d | Paolo Bonzini | * qemu_mutex_unlock_iothread: Unlock the main loop mutex.
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284 | d3b12f5d | Paolo Bonzini | *
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285 | d3b12f5d | Paolo Bonzini | * This function unlocks the main loop mutex. The mutex is taken by
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286 | d3b12f5d | Paolo Bonzini | * qemu_init_main_loop and always taken except while waiting on
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287 | d3b12f5d | Paolo Bonzini | * external events (such as with select). The mutex should be unlocked
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288 | d3b12f5d | Paolo Bonzini | * as soon as possible by threads other than the main loop thread,
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289 | d3b12f5d | Paolo Bonzini | * because it prevents the main loop from processing callbacks,
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290 | d3b12f5d | Paolo Bonzini | * including timers and bottom halves.
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291 | cbcfa041 | Paolo Bonzini | *
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292 | cbcfa041 | Paolo Bonzini | * NOTE: tools currently are single-threaded and qemu_mutex_unlock_iothread
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293 | cbcfa041 | Paolo Bonzini | * is a no-op there.
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294 | d3b12f5d | Paolo Bonzini | */
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295 | d3b12f5d | Paolo Bonzini | void qemu_mutex_unlock_iothread(void); |
296 | d3b12f5d | Paolo Bonzini | |
297 | 44a9b356 | Paolo Bonzini | /* internal interfaces */
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298 | 44a9b356 | Paolo Bonzini | |
299 | d3385eb4 | Paolo Bonzini | void qemu_fd_register(int fd); |
300 | 44a9b356 | Paolo Bonzini | void qemu_iohandler_fill(int *pnfds, fd_set *readfds, fd_set *writefds, fd_set *xfds); |
301 | 44a9b356 | Paolo Bonzini | void qemu_iohandler_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds, int rc); |
302 | 44a9b356 | Paolo Bonzini | |
303 | f627aab1 | Paolo Bonzini | QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
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304 | 44a9b356 | Paolo Bonzini | void qemu_bh_schedule_idle(QEMUBH *bh);
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305 | 44a9b356 | Paolo Bonzini | |
306 | 44a9b356 | Paolo Bonzini | #endif |