Refactor the pipe/eventfd abstraction
This introduces the wakeup fd interface, corresponding approximately to
the existing Google version, complete with a ported giant detailed usage
comment.
The implementation has two layers, "specialized" and "fallback". The
specialized layer is intended to be a suitable platform specific
implementation like eventfd, whereas "fallback" is probably pipe, with
runtime detection of whether the specialized version works on this
system (currently stubbed out).
diff --git a/Makefile b/Makefile
index 85f38cb..51c7786 100644
--- a/Makefile
+++ b/Makefile
@@ -1353,8 +1353,7 @@
src/core/iomgr/fd_posix.c \
src/core/iomgr/iomgr.c \
src/core/iomgr/iomgr_posix.c \
- src/core/iomgr/pollset_kick_posix.c \
- src/core/iomgr/pollset_kick_eventfd.c \
+ src/core/iomgr/pollset_kick.c \
src/core/iomgr/pollset_multipoller_with_poll_posix.c \
src/core/iomgr/pollset_posix.c \
src/core/iomgr/resolve_address_posix.c \
@@ -1366,6 +1365,10 @@
src/core/iomgr/tcp_posix.c \
src/core/iomgr/tcp_server_posix.c \
src/core/iomgr/time_averaged_stats.c \
+ src/core/iomgr/wakeup_fd.c \
+ src/core/iomgr/wakeup_fd_eventfd.c \
+ src/core/iomgr/wakeup_fd_nospecial.c \
+ src/core/iomgr/wakeup_fd_pipe.c \
src/core/statistics/census_init.c \
src/core/statistics/census_log.c \
src/core/statistics/census_rpc_stats.c \
@@ -1472,8 +1475,7 @@
src/core/iomgr/fd_posix.c: $(OPENSSL_DEP)
src/core/iomgr/iomgr.c: $(OPENSSL_DEP)
src/core/iomgr/iomgr_posix.c: $(OPENSSL_DEP)
-src/core/iomgr/pollset_kick_posix.c: $(OPENSSL_DEP)
-src/core/iomgr/pollset_kick_eventfd.c: $(OPENSSL_DEP)
+src/core/iomgr/pollset_kick.c: $(OPENSSL_DEP)
src/core/iomgr/pollset_multipoller_with_poll_posix.c: $(OPENSSL_DEP)
src/core/iomgr/pollset_posix.c: $(OPENSSL_DEP)
src/core/iomgr/resolve_address_posix.c: $(OPENSSL_DEP)
@@ -1485,6 +1487,10 @@
src/core/iomgr/tcp_posix.c: $(OPENSSL_DEP)
src/core/iomgr/tcp_server_posix.c: $(OPENSSL_DEP)
src/core/iomgr/time_averaged_stats.c: $(OPENSSL_DEP)
+src/core/iomgr/wakeup_fd.c: $(OPENSSL_DEP)
+src/core/iomgr/wakeup_fd_eventfd.c: $(OPENSSL_DEP)
+src/core/iomgr/wakeup_fd_nospecial.c: $(OPENSSL_DEP)
+src/core/iomgr/wakeup_fd_pipe.c: $(OPENSSL_DEP)
src/core/statistics/census_init.c: $(OPENSSL_DEP)
src/core/statistics/census_log.c: $(OPENSSL_DEP)
src/core/statistics/census_rpc_stats.c: $(OPENSSL_DEP)
@@ -1608,8 +1614,7 @@
objs/$(CONFIG)/src/core/iomgr/fd_posix.o:
objs/$(CONFIG)/src/core/iomgr/iomgr.o:
objs/$(CONFIG)/src/core/iomgr/iomgr_posix.o:
-objs/$(CONFIG)/src/core/iomgr/pollset_kick_posix.o:
-objs/$(CONFIG)/src/core/iomgr/pollset_kick_eventfd.o:
+objs/$(CONFIG)/src/core/iomgr/pollset_kick.o:
objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_poll_posix.o:
objs/$(CONFIG)/src/core/iomgr/pollset_posix.o:
objs/$(CONFIG)/src/core/iomgr/resolve_address_posix.o:
@@ -1621,6 +1626,10 @@
objs/$(CONFIG)/src/core/iomgr/tcp_posix.o:
objs/$(CONFIG)/src/core/iomgr/tcp_server_posix.o:
objs/$(CONFIG)/src/core/iomgr/time_averaged_stats.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_eventfd.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_nospecial.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_pipe.o:
objs/$(CONFIG)/src/core/statistics/census_init.o:
objs/$(CONFIG)/src/core/statistics/census_log.o:
objs/$(CONFIG)/src/core/statistics/census_rpc_stats.o:
@@ -1764,8 +1773,7 @@
src/core/iomgr/fd_posix.c \
src/core/iomgr/iomgr.c \
src/core/iomgr/iomgr_posix.c \
- src/core/iomgr/pollset_kick_posix.c \
- src/core/iomgr/pollset_kick_eventfd.c \
+ src/core/iomgr/pollset_kick.c \
src/core/iomgr/pollset_multipoller_with_poll_posix.c \
src/core/iomgr/pollset_posix.c \
src/core/iomgr/resolve_address_posix.c \
@@ -1777,6 +1785,10 @@
src/core/iomgr/tcp_posix.c \
src/core/iomgr/tcp_server_posix.c \
src/core/iomgr/time_averaged_stats.c \
+ src/core/iomgr/wakeup_fd.c \
+ src/core/iomgr/wakeup_fd_eventfd.c \
+ src/core/iomgr/wakeup_fd_nospecial.c \
+ src/core/iomgr/wakeup_fd_pipe.c \
src/core/statistics/census_init.c \
src/core/statistics/census_log.c \
src/core/statistics/census_rpc_stats.c \
@@ -1883,8 +1895,7 @@
objs/$(CONFIG)/src/core/iomgr/fd_posix.o:
objs/$(CONFIG)/src/core/iomgr/iomgr.o:
objs/$(CONFIG)/src/core/iomgr/iomgr_posix.o:
-objs/$(CONFIG)/src/core/iomgr/pollset_kick_posix.o:
-objs/$(CONFIG)/src/core/iomgr/pollset_kick_eventfd.o:
+objs/$(CONFIG)/src/core/iomgr/pollset_kick.o:
objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_poll_posix.o:
objs/$(CONFIG)/src/core/iomgr/pollset_posix.o:
objs/$(CONFIG)/src/core/iomgr/resolve_address_posix.o:
@@ -1896,6 +1907,10 @@
objs/$(CONFIG)/src/core/iomgr/tcp_posix.o:
objs/$(CONFIG)/src/core/iomgr/tcp_server_posix.o:
objs/$(CONFIG)/src/core/iomgr/time_averaged_stats.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_eventfd.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_nospecial.o:
+objs/$(CONFIG)/src/core/iomgr/wakeup_fd_pipe.o:
objs/$(CONFIG)/src/core/statistics/census_init.o:
objs/$(CONFIG)/src/core/statistics/census_log.o:
objs/$(CONFIG)/src/core/statistics/census_rpc_stats.o: