1 // Copyright (c) 2011-2015 Ryan Prichard
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to
5 // deal in the Software without restriction, including without limitation the
6 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 // sell copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
29 static void setFdNonBlock(int fd) {
30 int status = fcntl(fd, F_GETFL);
31 fcntl(fd, F_SETFL, status | O_NONBLOCK);
34 WakeupFd::WakeupFd() {
36 if (pipe(pipeFd) != 0) {
37 perror("Could not create internal wakeup pipe");
40 m_pipeReadFd = pipeFd[0];
41 m_pipeWriteFd = pipeFd[1];
42 setFdNonBlock(m_pipeReadFd);
43 setFdNonBlock(m_pipeWriteFd);
46 WakeupFd::~WakeupFd() {
51 void WakeupFd::set() {
55 ret = write(m_pipeWriteFd, &dummy, 1);
56 } while (ret < 0 && errno == EINTR);
59 void WakeupFd::reset() {
62 int amount = read(m_pipeReadFd, tmpBuf, sizeof(tmpBuf));
63 if (amount < 0 && errno == EAGAIN) {
65 } else if (amount <= 0) {
66 perror("error reading from internal wakeup pipe");