postgresql/src/port/srandom.c

/*-------------------------------------------------------------------------
 *
 * srandom.c
 *	  srandom() wrapper
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/port/srandom.c
 *
 *-------------------------------------------------------------------------
 */

#include "c.h"

#include <math.h>


void
srandom(unsigned int seed)
{
	pg_srand48((long int) seed);
}
Update /port C header descriptions. 2003-11-12 00:52:45 +01:00			`/*-------------------------------------------------------------------------`
			`*`
			`* srandom.c`
			`* srandom() wrapper`
			`*`
Update copyright for 2016 Backpatch certain files through 9.1 2016-01-02 19:33:40 +01:00			`* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group`
Update /port C header descriptions. 2003-11-12 00:52:45 +01:00			`* Portions Copyright (c) 1994, Regents of the University of California`
			`*`
			`*`
			`* IDENTIFICATION`
Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00			`* src/port/srandom.c`
Update /port C header descriptions. 2003-11-12 00:52:45 +01:00			`*`
			`*-------------------------------------------------------------------------`
			`*/`
Rename config.h to pg_config.h and os.h to pg_config_os.h, fix a number of places that were including the wrong files. 2001-08-24 16:07:50 +02:00
			`#include "c.h"`
More cleanups...only need one rusagestub.h 1997-12-19 14:35:17 +01:00
Update #include cleanups 1999-07-16 05:14:30 +02:00			`#include <math.h>`
Fix a whole bunch of #includes that were either wrong or redundant. The first rule of portability for us is 'thou shalt have no other gods before c.h', and a whole lot of these files were either not including c.h at all, or including random system headers beforehand, either of which sins can mess up largefile support nicely. Once you have included c.h, there is no need to re-include what it includes, either. 2005-07-28 06:03:14 +02:00
Clean up some minor compile warnings. 1999-02-07 23:07:02 +01:00
port.c no longer required...individual functions that were in there are auto-generated via configure individual functions in individual files 1997-12-19 03:27:20 +01:00			`void`
More cleanups...several ports are major redundancies of other ports 1997-12-19 03:46:25 +01:00			`srandom(unsigned int seed)`
port.c no longer required...individual functions that were in there are auto-generated via configure individual functions in individual files 1997-12-19 03:27:20 +01:00			`{`
Make pgbench use erand48() rather than random(). glibc renders random() thread-safe by wrapping a futex lock around it; testing reveals that this limits the performance of pgbench on machines with many CPU cores. Rather than switching to random_r(), which is only available on GNU systems and crashes unless you use undocumented alchemy to initialize the random state properly, switch to our built-in implementation of erand48(), which is both thread-safe and concurrent. Since the list of reasons not to use the operating system's erand48() is getting rather long, rename ours to pg_erand48() (and similarly for our implementations of lrand48() and srand48()) and just always use those. We were already doing this on Cygwin anyway, and the glibc implementation is not quite thread-safe, so pgbench wouldn't be able to use that either. Per discussion with Tom Lane. 2011-08-03 22:26:40 +02:00			`pg_srand48((long int) seed);`
port.c no longer required...individual functions that were in there are auto-generated via configure individual functions in individual files 1997-12-19 03:27:20 +01:00			`}`