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event/Loop: split InjectBreak() from Break()

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This commit is contained in:
Max Kellermann
2022-11-22 22:26:16 +01:00
parent a57cf443ed
commit a3b32819b1
3 changed files with 33 additions and 17 deletions
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31
src/event/Loop.hxx
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@@ -115,7 +115,7 @@ class EventLoop final
bool alive;
#endif
std::atomic_bool quit{false};
bool quit = false;
/**
* True when the object has been modified and another check is
@@ -124,6 +124,8 @@ class EventLoop final
bool again;
#ifdef HAVE_THREADED_EVENT_LOOP
bool quit_injected = false;
/**
* True when handling callbacks, false when waiting for I/O or
* timeout.
@@ -187,11 +189,30 @@ public:
#endif
/**
* Stop execution of this #EventLoop at the next chance. This
* method is thread-safe and non-blocking: after returning, it
* is not guaranteed that the EventLoop has really stopped.
* Stop execution of this #EventLoop at the next chance.
*
* This method is not thread-safe. For stopping the
* #EventLoop from within another thread, use InjectBreak().
*/
void Break() noexcept;
void Break() noexcept {
quit = true;
}
#ifdef HAVE_THREADED_EVENT_LOOP
/**
* Like Break(), but thread-safe. It is also non-blocking:
* after returning, it is not guaranteed that the EventLoop
* has really stopped.
*/
void InjectBreak() noexcept {
{
const std::scoped_lock lock{mutex};
quit_injected = true;
}
wake_fd.Write();
}
#endif // HAVE_THREADED_EVENT_LOOP
bool AddFD(int fd, unsigned events, SocketEvent &event) noexcept;
bool ModifyFD(int fd, unsigned events, SocketEvent &event) noexcept;