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| author | Janne Blomqvist <jb@gcc.gnu.org> | 2011-11-01 13:44:12 +0200 |
|---|---|---|
| committer | Janne Blomqvist <jb@gcc.gnu.org> | 2011-11-01 13:44:12 +0200 |
| commit | ea5e3c042b9d6867475df08c95f9181bea21c5f0 (patch) | |
| tree | 3763f8dc50f9d3254ab5d03e9aebcd277367ab70 /libgfortran/io | |
| parent | 1f9ed162eb30f1b40b65d164b3a40ac78e1f006e (diff) | |
| download | gcc-ea5e3c042b9d6867475df08c95f9181bea21c5f0.zip gcc-ea5e3c042b9d6867475df08c95f9181bea21c5f0.tar.gz gcc-ea5e3c042b9d6867475df08c95f9181bea21c5f0.tar.bz2 | |
Cleanup NEWUNIT allocation.
2011-11-01 Janne Blomqvist <jb@gcc.gnu.org>
* io/io.h (next_available_newunit): Remove prototype.
* io/unit.h (next_available_newunit): Make variable static,
initialize it.
(init_units): Don't initialize next_available_newunit.
(get_unique_unit_number): Use atomic builtin if available.
From-SVN: r180734
Diffstat (limited to 'libgfortran/io')
| -rw-r--r-- | libgfortran/io/io.h | 4 | ||||
| -rw-r--r-- | libgfortran/io/unit.c | 14 |
2 files changed, 8 insertions, 10 deletions
diff --git a/libgfortran/io/io.h b/libgfortran/io/io.h index 23f07ca..3569c54 100644 --- a/libgfortran/io/io.h +++ b/libgfortran/io/io.h @@ -576,10 +576,6 @@ gfc_unit; extern gfc_offset max_offset; internal_proto(max_offset); -/* Unit number to be assigned when NEWUNIT is used in an OPEN statement. */ -extern GFC_INTEGER_4 next_available_newunit; -internal_proto(next_available_newunit); - /* Unit tree root. */ extern gfc_unit *unit_root; internal_proto(unit_root); diff --git a/libgfortran/io/unit.c b/libgfortran/io/unit.c index b4d10cd..33072fe 100644 --- a/libgfortran/io/unit.c +++ b/libgfortran/io/unit.c @@ -71,8 +71,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see /* Subroutines related to units */ -GFC_INTEGER_4 next_available_newunit; +/* Unit number to be assigned when NEWUNIT is used in an OPEN statement. */ #define GFC_FIRST_NEWUNIT -10 +static GFC_INTEGER_4 next_available_newunit = GFC_FIRST_NEWUNIT; #define CACHE_SIZE 3 static gfc_unit *unit_cache[CACHE_SIZE]; @@ -525,8 +526,6 @@ init_units (void) __GTHREAD_MUTEX_INIT_FUNCTION (&unit_lock); #endif - next_available_newunit = GFC_FIRST_NEWUNIT; - if (options.stdin_unit >= 0) { /* STDIN */ u = insert_unit (options.stdin_unit); @@ -808,16 +807,19 @@ get_unique_unit_number (st_parameter_open *opp) { GFC_INTEGER_4 num; +#ifdef HAVE_SYNC_FETCH_AND_ADD + num = __sync_fetch_and_add (&next_available_newunit, -1); +#else __gthread_mutex_lock (&unit_lock); num = next_available_newunit--; + __gthread_mutex_unlock (&unit_lock); +#endif /* Do not allow NEWUNIT numbers to wrap. */ - if (next_available_newunit >= GFC_FIRST_NEWUNIT ) + if (num > GFC_FIRST_NEWUNIT ) { - __gthread_mutex_unlock (&unit_lock); generate_error (&opp->common, LIBERROR_INTERNAL, "NEWUNIT exhausted"); return 0; } - __gthread_mutex_unlock (&unit_lock); return num; } |