postgresql

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Tom Lane 291a957745 Split the LDFLAGS make variable into two parts: LDFLAGS is now used for linking both executables and shared libraries, and we add on LDFLAGS_EX when linking executables or LDFLAGS_SL when linking shared libraries. This provides a significantly cleaner way of dealing with link-time switches than the former behavior. Also, make sure that the various platform-specific %.so: %.o rules incorporate LDFLAGS and LDFLAGS_SL; most of them missed that before. (I did not add these variables for the platforms that invoke $(LD) directly, however. It's not clear if we can do that safely, since for the most part we assume these variables use CC command-line syntax.) Per gripe from Aaron Swenson and subsequent investigation.		2010-07-05 18:54:38 +00:00
..
Makefile	Split the LDFLAGS make variable into two parts: LDFLAGS is now used for	2010-07-05 18:54:38 +00:00
README	thread-safety	2009-12-02 14:07:26 +00:00
thread_test.c	Update copyright for the year 2010.	2010-01-02 16:58:17 +00:00

README

$PostgreSQL: pgsql/src/test/thread/README,v 1.3 2009/12/02 14:07:26 momjian Exp $

Threading
=========

This program is run by configure to determine if threading is
properly supported on the platform.

You can run the program manually to see details, which shows if your
native libc functions are thread-safe, or if we use *_r functions or
thread locking.

To use this program manually, you must:

	o run "configure"
	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.