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#pragma once
#include <library/cpp/coroutine/engine/events.h>
#include <library/cpp/coroutine/engine/impl.h>
#include <library/cpp/coroutine/engine/network.h>
#include <util/network/socket.h>
#include <library/cpp/deprecated/atomic/atomic.h>
#include <util/system/pipe.h>
// TPipeEvent and TPipeSemaphore try to minimize number of coroutines reading from same pipe
// because its actually quite expensive with >1000 coroutines waiting on same event/semaphore
// Using this class you can block in coroutine on waiting
// a signal from outer thread.
// Usual thread synchronization primitives are not appropriate
// because they will block all coroutines in single thread.
class TPipeEvent {
public:
explicit TPipeEvent()
: Signaled(0)
, NumWaiting(0)
{
TPipeHandle::Pipe(SignalRecvPipe, SignalSendPipe);
SetNonBlock(SignalRecvPipe);
SetNonBlock(SignalSendPipe);
}
void Signal() {
if (AtomicCas(&Signaled, 1, 0)) {
char tmp = 1;
SignalSendPipe.Write(&tmp, 1);
}
}
void Wait(TCont* cont) {
if (++NumWaiting > 1) {
ToWake.WaitI(cont);
}
char tmp;
NCoro::ReadI(cont, SignalRecvPipe, &tmp, 1).Checked();
AtomicSet(Signaled, 0);
if (--NumWaiting > 0) {
ToWake.Signal();
}
}
private:
TAtomic Signaled;
size_t NumWaiting;
TContWaitQueue ToWake;
TPipeHandle SignalRecvPipe;
TPipeHandle SignalSendPipe;
};
class TPipeSemaphore {
public:
explicit TPipeSemaphore()
: Value(0)
, NumWaiting(0)
{
TPipeHandle::Pipe(SignalRecvPipe, SignalSendPipe);
SetNonBlock(SignalRecvPipe);
SetNonBlock(SignalSendPipe);
}
void Inc() {
if (AtomicIncrement(Value) <= 0) {
char tmp = 1;
SignalSendPipe.Write(&tmp, 1);
}
}
void Dec(TCont* cont) {
if (AtomicDecrement(Value) < 0) {
if (++NumWaiting > 1) {
ToWake.WaitI(cont);
}
char tmp;
NCoro::ReadI(cont, SignalRecvPipe, &tmp, 1).Checked();
if (--NumWaiting > 0) {
ToWake.Signal();
}
}
}
private:
TAtomic Value;
size_t NumWaiting;
TContWaitQueue ToWake;
TPipeHandle SignalRecvPipe;
TPipeHandle SignalSendPipe;
};
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