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jam: use posix_spawnp() instead of fork() on linux.

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the gain is about 10% on a 8-job kernel full build.
This commit is contained in:
Jérôme Duval 2018-01-06 16:48:36 +01:00
parent 20a46bd5f9
commit 923a34a14b
1 changed files with 18 additions and 0 deletions
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18
jam/execunix.c
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@ -50,8 +50,18 @@
# include <process.h>
# endif
# ifdef __linux__
# define USE_POSIX_SPAWN
# endif
# ifdef unix
# include <unistd.h>
# ifdef USE_POSIX_SPAWN
extern char **environ;
# include <spawn.h>
# endif
# endif
# ifdef OS_NT
@ -226,6 +236,13 @@ execcmd(
exit( EXITBAD );
}
# else
# ifdef USE_POSIX_SPAWN
if (posix_spawnp(&pid, argv[0], NULL, NULL, (char * const*)argv, environ) != 0)
{
perror( "posix_spawnp" );
exit( EXITBAD );
}
# else
# ifdef NO_VFORK
if ((pid = fork()) == 0)
{
@ -245,6 +262,7 @@ execcmd(
perror( "vfork" );
exit( EXITBAD );
}
# endif
# endif
/* Save the operation for execwait() to find. */