WL#5363: Thread Pool Service Interface

In order to allow thread schedulers to be dynamically loaded,
it is necessary to make the following changes to the server:

- Two new service interfaces

- Modifications to InnoDB to inform the thread scheduler of state changes.

- Changes to the VIO subsystem for checking if data is available on a socket.

- Elimination of remains of the old thread pool implementation.

The two new service interfaces introduces are:

my_thread_scheduler
  A service interface to register a thread
  scheduler.

thd_wait
  A service interface to inform thread scheduler
  that the thread is about to start waiting.

In addition, the patch adds code that:

- Add a call to thd_wait for table locks in mysys
  thd_lock.c by introducing a set function that
  can be used to set a callback to be used when
  waiting on a lock and resuming from waiting.

- Calling the mysys set function from the server
  to set the callbacks correctly.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 5ede6d7591f..6f53ba8e296 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -24,6 +24,8 @@ HEADERS_ABI =		mysql.h mysql_com.h mysql_time.h \
 pkginclude_HEADERS =	$(HEADERS_ABI) my_dbug.h m_string.h my_sys.h \
 			my_xml.h mysql_embed.h mysql/services.h \
 			mysql/service_my_snprintf.h mysql/service_thd_alloc.h \
+			mysql/service_thread_scheduler.h \
+			mysql/service_thd_wait.h \
 		  	my_pthread.h my_no_pthread.h \
 			mysql/psi/psi.h mysql/psi/mysql_thread.h \
 			mysql/psi/mysql_file.h \