# Copyright 2006 Roland Schwarz.
# Distributed under the Boost Software License, Version 1.0. (See
# accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
#
# This work is a reimplementation along the design and ideas
# of William E. Kempf.

import modules ;
import os ;
import feature ;
import property ;

# supported threading api's
feature.feature thrd-api : pthread win32 : symmetric ;

# save a reference to the original lib rule
IMPORT : lib : $(__name__) : type.lib ;

# local override of the global lib rule
rule lib ( name  : sources * : requirements * : default-build * : usage-requirements * )
{
	if <thrd-api>pthread in $(requirements) 
	{
		if [ os.name ] = "NT"
		{
			local PTW32_INCLUDE = [ modules.peek : PTW32_INCLUDE ] ;
			local PTW32_LIB = [ modules.peek : PTW32_LIB ] ;
			if $(PTW32_INCLUDE) && $(PTW32_LIB) 
			{
				requirements = 
					[ property.refine $(requirements) : 
						<define>BOOST_HAS_PTHREADS 
						<include>$(PTW32_INCLUDE)
						<library>$(PTW32_LIB)
					] ;
			}
			else 
			{
				requirements += <build>no ;
				# it would be nice if this message appears only once ...
				# but I cannot figure out how to detectd the second phase.
				echo "******************************************************" ;
				echo "Building Boost.Thread without pthread support" ;
				echo "If you need pthread you should specify the paths." ;
				echo "For example:" ;
				echo "PTW32_INCLUDE=C:\\Program Files\\ptw32\\Pre-built2\\include" ;
				echo "PTW32_LIB=C:\\Program Files\\ptw32\\Pre-built2\\lib\\pthreadVC2.lib" ;
				echo "******************************************************" ;
			}	
		}	
	}

	return [ type.lib $(name) : $(sources) : $(requirements) : $(default-build) : $(usage-requirements) ] ;
}

# auto export of rule lib to calling module only
IMPORT $(__name__) : lib : [ CALLER_MODULE 1 ] : lib ;

rule default-api
{
	if [ os.name ] = "NT"
	{
		return <thrd-api>win32 ;
	}
	else
	{
		return <thrd-api>pthread ;
	}
}