N3_sub/modules/waf/playground/test_times/wscript

#! /usr/bin/env python

"""
Create a few c programs, measure the execution times on "waf times"
"""

def options(opt):
	opt.load('compiler_c')

def configure(conf):
	conf.load('compiler_c')

def build(bld):

	# add a task to create a .c file
	from waflib.TaskGen import feature, before_method
	@feature('foo')
	@before_method('process_source')
	def add_one_c_file(self):
		node = self.path.find_or_declare('main%d.c' % self.num)
		self.create_task('write_file', [], node)
		self.source = [node] # add the .c file to the list of source

	# write a slow main.c file
	from waflib.Task import Task
	class write_file(Task):
		def run(self):
			self.outputs[0].write('''
#include <stdio.h>
int main() {
	int i;
	char buf[50];
	for (i=0; i < %d; ++i) {
		sprintf(buf, "%%l\\n", i);
	}
	return 0;
}''' % 2 ** (13 + self.generator.num))

	for i in range(10):
		# create a few programs
		bld(features='foo c cprogram', num=i, target='app%d' % i)

	if bld.cmd == 'times':
		# measure the execution times when calling "waf times"
		def measure(ctx):
			for x in range(10):
				tg = ctx.get_tgen_by_name('app%d' % x)
				name = tg.link_task.outputs[0].abspath()
				ctx.exec_command('time %s' % name, shell=True)
		bld.add_post_fun(measure)

from waflib.Build import BuildContext
class times(BuildContext):
	cmd = 'times'