src/test/thread/README

$PostgreSQL: pgsql/src/test/thread/README,v 1.2 2008/03/21 13:23:29 momjian Exp $

Threading
=========

This program should be run by developers wishing to enable threading on
new platforms.

Run thread_test program to determine if your native libc functions are
thread-safe, or if we should use *_r functions or thread locking.

To use this program, you must:

	o run "configure --enable-thread-safety"
	o compile the main source tree
	o compile and run this program

If your platform requires special thread flags that are not tested by
/config/acx_pthread.m4, add PTHREAD_CFLAGS and PTHREAD_LIBS defines to 
your template/${port} file.

Windows Systems
===============

Windows systems do not vary in their thread-safeness in the same way that
other systems might, nor do they generally have pthreads installed, hence 
on Windows this test is skipped by the configure program (pthreads is 
required by the test program, but not PostgreSQL itself). If you do wish
to test your system however, you can do so as follows:

1) Install pthreads in you Mingw/Msys environment. You can download pthreads
   from ftp://sources.redhat.com/pub/pthreads-win32/.
   
2) Build the test program:

   gcc -o thread_test.exe \
    -D_REENTRANT \
    -D_THREAD_SAFE \
    -D_POSIX_PTHREAD_SEMANTICS \
    -I../../../src/include/port/win32 \
    thread_test.c \
    -lwsock32 \
    -lpthreadgc2

3) Run thread_test.exe. You should see output like:

    dpage@PC30:/cvs/pgsql/src/tools/thread$ ./thread_test
    Your GetLastError() is thread-safe.
    Your system uses strerror() which is thread-safe.
    getpwuid_r()/getpwuid() are not applicable to Win32 platforms.
    Your system uses gethostbyname which is thread-safe.

    Your platform is thread-safe.