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| author | Janne Blomqvist <jb@gcc.gnu.org> | 2019-05-21 18:17:44 +0300 |
|---|---|---|
| committer | Janne Blomqvist <jb@gcc.gnu.org> | 2019-05-21 18:17:44 +0300 |
| commit | 1a815b1822c1ee00a3e48f68d445598c576d9edf (patch) | |
| tree | e71dd4e2422c4a2b8454127f89bd55c759ccff6f | |
| parent | 692af872fa50106af090e17cef92481207c33e89 (diff) | |
| download | gcc-1a815b1822c1ee00a3e48f68d445598c576d9edf.zip gcc-1a815b1822c1ee00a3e48f68d445598c576d9edf.tar.gz gcc-1a815b1822c1ee00a3e48f68d445598c576d9edf.tar.bz2 | |
libfortran/90038: Document new wait=.false. implementation
2019-05-21 Janne Blomqvist <jb@gcc.gnu.org>
PR libfortran/90038
* intrinsic.texi (EXECUTE_COMMAND_LINE): Explain new
wait=.false. implementation.
From-SVN: r271468
| -rw-r--r-- | gcc/fortran/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/fortran/intrinsic.texi | 16 |
2 files changed, 16 insertions, 6 deletions
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog index e5215aa..e6ae6bc 100644 --- a/gcc/fortran/ChangeLog +++ b/gcc/fortran/ChangeLog @@ -1,3 +1,9 @@ +2019-05-21 Janne Blomqvist <jb@gcc.gnu.org> + + PR libfortran/90038 + * intrinsic.texi (EXECUTE_COMMAND_LINE): Explain new + wait=.false. implementation. + 2019-05-20 Mark Eggleston <markeggleston@codethink.com> * gfortran.texi: Remove reference to the ASSIGN statement, capitalise diff --git a/gcc/fortran/intrinsic.texi b/gcc/fortran/intrinsic.texi index ee857c6..f3f4c00 100644 --- a/gcc/fortran/intrinsic.texi +++ b/gcc/fortran/intrinsic.texi @@ -5596,12 +5596,12 @@ end program atomic @code{EXECUTE_COMMAND_LINE} runs a shell command, synchronously or asynchronously. -The @code{COMMAND} argument is passed to the shell and executed, using -the C library's @code{system} call. (The shell is @code{sh} on Unix -systems, and @code{cmd.exe} on Windows.) If @code{WAIT} is present -and has the value false, the execution of the command is asynchronous -if the system supports it; otherwise, the command is executed -synchronously. +The @code{COMMAND} argument is passed to the shell and executed (The +shell is @code{sh} on Unix systems, and @code{cmd.exe} on Windows.). +If @code{WAIT} is present and has the value false, the execution of +the command is asynchronous if the system supports it; otherwise, the +command is executed synchronously using the C library's @code{system} +call. The three last arguments allow the user to get status information. After synchronous execution, @code{EXITSTAT} contains the integer exit code of @@ -5613,6 +5613,10 @@ Note that the @code{system} function need not be thread-safe. It is the responsibility of the user to ensure that @code{system} is not called concurrently. +For asynchronous execution on supported targets, the POSIX +@code{posix_spawn} or @code{fork} functions are used. Also, a signal +handler for the @code{SIGCHLD} signal is installed. + @item @emph{Standard}: Fortran 2008 and later |