From 347daceced3a516fec8080e0fe640f68c137db76 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Thu, 5 Dec 2019 16:15:30 -0500
Subject: use pipe to emulate eventfd on mac; add install script

---
 include/salticidae/event.h | 37 ++++++++-----------------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

(limited to 'include')

diff --git a/include/salticidae/event.h b/include/salticidae/event.h
index fe94c0a..52cb058 100644
--- a/include/salticidae/event.h
+++ b/include/salticidae/event.h
@@ -577,7 +577,10 @@ class NotifyFd {
             throw SalticidaeError(SALTI_ERROR_FD);
     }
     bool reset() {
-        return read(fds[0], dummy, 8) == 8;
+        // clear the pipe buffer (not atomically)
+        while (read(fds[0], dummy, 8) > 0);
+        // may not work for MPMC, but salticidae currently doesn't use that
+        return true;
     }
     void notify() {
         write(fds[1], dummy, 8);
@@ -597,28 +600,18 @@ template<typename T>
 class MPSCQueueEventDriven: public MPSCQueue<T> {
     private:
     std::atomic<bool> wait_sig;
-    //int fd;
     NotifyFd nfd;
     FdEvent ev;
 
     public:
     MPSCQueueEventDriven():
-            wait_sig(true) {
-            //fd(eventfd(0, EFD_NONBLOCK)) {
-        //if (fd == -1) throw SalticidaeError(SALTI_ERROR_FD);
-    }
-    ~MPSCQueueEventDriven() {
-        //close(fd);
-        unreg_handler();
-    }
+            wait_sig(true) {}
+    ~MPSCQueueEventDriven() { unreg_handler(); }
 
     template<typename Func>
     void reg_handler(const EventContext &ec, Func &&func) {
         ev = FdEvent(ec, nfd.read_fd(),
                     [this, func=std::forward<Func>(func)](int, int) {
-                    //fprintf(stderr, "%x\n", std::this_thread::get_id());
-                    //uint64_t t;
-                    //read(fd, &t, 8);
                     nfd.reset();
                     // the only undesirable case is there are some new items
                     // enqueued before recovering wait_sig to true, so the consumer
@@ -629,7 +622,6 @@ class MPSCQueueEventDriven: public MPSCQueue<T> {
                     wait_sig.exchange(true, std::memory_order_acq_rel);
                     if (func(*this))
                         nfd.notify();
-                        //write(fd, &dummy, 8);
                 });
         ev.add(FdEvent::READ);
     }
@@ -644,7 +636,6 @@ class MPSCQueueEventDriven: public MPSCQueue<T> {
         if (wait_sig.exchange(false, std::memory_order_acq_rel))
         {
             //SALTICIDAE_LOG_DEBUG("mpsc notify");
-            //write(fd, &dummy, 8);
             nfd.notify();
         }
         return true;
@@ -658,33 +649,22 @@ template<typename T>
 class MPMCQueueEventDriven: public MPMCQueue<T> {
     private:
     std::atomic<bool> wait_sig;
-    //int fd;
     NotifyFd nfd;
     std::vector<FdEvent> evs;
 
     public:
     MPMCQueueEventDriven():
-            wait_sig(true) {
-            //fd(eventfd(0, EFD_NONBLOCK)) {
-        //if (fd == -1) throw SalticidaeError(SALTI_ERROR_FD);
-    }
-    ~MPMCQueueEventDriven() {
-        //close(fd);
-        unreg_handlers();
-    }
+            wait_sig(true) {}
+    ~MPMCQueueEventDriven() { unreg_handlers(); }
 
     // this function is *NOT* thread-safe
     template<typename Func>
     void reg_handler(const EventContext &ec, Func &&func) {
         FdEvent ev(ec, nfd.read_fd(), [this, func=std::forward<Func>(func)](int, int) {
-            //fprintf(stderr, "%x\n", std::this_thread::get_id());
-            uint64_t t;
-            //if (read(fd, &t, 8) != 8) return;
             if (!nfd.reset()) return;
             // only one consumer should be here a a time
             wait_sig.exchange(true, std::memory_order_acq_rel);
             if (func(*this))
-                //write(fd, &dummy, 8);
                 nfd.notify();
         });
         ev.add(FdEvent::READ);
@@ -701,7 +681,6 @@ class MPMCQueueEventDriven: public MPMCQueue<T> {
         if (wait_sig.exchange(false, std::memory_order_acq_rel))
         {
             //SALTICIDAE_LOG_DEBUG("mpmc notify");
-            //write(fd, &dummy, 8);
             nfd.notify();
         }
         return true;
-- 
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