From c9593dfc5796a98b94ef516fce662f2e040acffe Mon Sep 17 00:00:00 2001
From: Garrett D'Amore <garrett@damore.org>
Date: Sat, 21 Jan 2017 20:05:48 -0800
Subject: Initial swag at notification pipes (not used yet).

---
 src/CMakeLists.txt              |  2 ++
 src/core/platform.h             | 24 ++++++++++++++++++++++++
 src/platform/posix/posix_impl.h |  1 +
 src/platform/windows/win_impl.h |  2 ++
 src/platform/windows/win_net.c  |  2 +-
 5 files changed, 30 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2df849ae..82d7205d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -71,6 +71,7 @@ set (NNG_SOURCES
     platform/posix/posix_debug.c
     platform/posix/posix_ipc.c
     platform/posix/posix_net.c
+    platform/posix/posix_pipe.c
     platform/posix/posix_rand.c
     platform/posix/posix_thread.c
 
@@ -79,6 +80,7 @@ set (NNG_SOURCES
     platform/windows/win_debug.c
     platform/windows/win_ipc.c
     platform/windows/win_net.c
+    platform/windows/win_pipe.c
     platform/windows/win_rand.c
     platform/windows/win_thread.c
 
diff --git a/src/core/platform.h b/src/core/platform.h
index 7afd33ef..14b3aaed 100644
--- a/src/core/platform.h
+++ b/src/core/platform.h
@@ -256,6 +256,30 @@ extern int nni_plat_ipc_recv(nni_plat_ipcsock *, nni_iov *, int);
 // to seed up to 256 bytes of data.
 extern void nni_plat_seed_prng(void *, size_t);
 
+// nni_plat_pipe creates a pair of linked file descriptors that are
+// suitable for notification via SENDFD/RECVFD.  These are platform
+// specific and exposed to applications for integration into event loops.
+// The first pipe is written to by nng to notify, and the second pipe is
+// generally read from to clear the event.   The implementation is not
+// obliged to provide two pipes -- for example eventfd can be used with
+// just a single file descriptor.  In such a case the implementation may
+// just provide the same value twice.
+extern int nni_plat_pipe_open(int *, int *);
+
+// nni_plat_pipe_push pushses a notification to the pipe.  Usually this
+// will just be a non-blocking attempt to write a single byte.  It may
+// however use any other underlying system call that is appropriate.
+extern void nni_plat_pipe_push(int);
+
+// nni_plat_pipe_pull pulls a notification from the pipe.  Usually this
+// will just be a non-blocking read.  (The pull should attempt to read
+// all data on the pipe.)
+extern void nni_plat_pipe_pull(int);
+
+// nni_plat_pipe_close closes both pipes that were provided by the open
+// routine.
+extern void nni_plat_pipe_close(int, int);
+
 // Actual platforms we support.  This is included up front so that we can
 // get the specific types that are supplied by the platform.
 #if defined(PLATFORM_POSIX)
diff --git a/src/platform/posix/posix_impl.h b/src/platform/posix/posix_impl.h
index 3faebfd4..56cc5937 100644
--- a/src/platform/posix/posix_impl.h
+++ b/src/platform/posix/posix_impl.h
@@ -22,6 +22,7 @@
 #define PLATFORM_POSIX_CLOCK
 #define PLATFORM_POSIX_IPC
 #define PLATFORM_POSIX_NET
+#define PLATFORM_POSIX_PIPE
 #define PLATFORM_POSIX_RANDOM
 #define PLATFORM_POSIX_THREAD
 
diff --git a/src/platform/windows/win_impl.h b/src/platform/windows/win_impl.h
index e63553a5..7bb71707 100644
--- a/src/platform/windows/win_impl.h
+++ b/src/platform/windows/win_impl.h
@@ -69,6 +69,8 @@ struct nni_plat_cv {
 	CRITICAL_SECTION *	cs;
 };
 
+extern int nni_winsock_error(int);
+
 #endif  // PLATFORM_WINDOWS
 
 #endif  // PLATFORM_WIN_IMPL_H
diff --git a/src/platform/windows/win_net.c b/src/platform/windows/win_net.c
index cd5862ff..678ccfb9 100644
--- a/src/platform/windows/win_net.c
+++ b/src/platform/windows/win_net.c
@@ -84,7 +84,7 @@ nni_plat_wsa_errnos[] = {
 };
 
 
-static int
+int
 nni_winsock_error(int werr)
 {
 	int i;
-- 
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