From 9cbecd06be8bba398595990b0ecb4156d4a19aad Mon Sep 17 00:00:00 2001 From: Janne Blomqvist Date: Mon, 10 Nov 2014 02:17:16 +0200 Subject: [PATCH] PR 47007 and 61847 Locale failures in libgfortran. 2014-11-10 Janne Blomqvist PR libfortran/47007 PR libfortran/61847 * config.h.in: Regenerated. * configure: Regenerated. * configure.ac (AC_CHECK_HEADERS_ONCE): Check for xlocale.h. (AC_CHECK_FUNCS_ONCE): Check for newlocale, freelocale, uselocale, strerror_l. * io/io.h (locale.h): Include. (xlocale.h): Include if present. (c_locale): New variable. (old_locale): New variable. (old_locale_ctr): New variable. (old_locale_lock): New variable. (st_parameter_dt): Add old_locale member. * io/transfer.c (data_transfer_init): Set locale to "C" if doing formatted transfer. (finalize_transfer): Reset locale to previous. * io/unit.c (c_locale): New variable. (old_locale): New variable. (old_locale_ctr): New variable. (old_locale_lock): New variable. (init_units): Init c_locale, init old_locale_lock. (close_units): Free c_locale. * runtime/error.c (locale.h): Include. (xlocale.h): Include if present. (gf_strerror): Use strerror_l if available. Reset locale to LC_GLOBAL_LOCALE for strerror_r branch. 2014-11-10 Janne Blomqvist PR libfortran/47007 PR libfortran/61847 * gfortran.texi: Add note about locale issues to thread-safety section. From-SVN: r217273 --- gcc/fortran/ChangeLog | 7 +++++ gcc/fortran/gfortran.texi | 24 +++++++++++++--- libgfortran/ChangeLog | 30 ++++++++++++++++++++ libgfortran/config.h.in | 15 ++++++++++ libgfortran/configure | 19 +++++++++++-- libgfortran/configure.ac | 5 ++-- libgfortran/io/io.h | 27 ++++++++++++++++++ libgfortran/io/transfer.c | 55 +++++++++++++++++++++++++++++-------- libgfortran/io/unit.c | 32 +++++++++++++++++++++ libgfortran/runtime/error.c | 23 ++++++++++++++-- 10 files changed, 215 insertions(+), 22 deletions(-) diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog index 3a8e658ee86..576e69407f1 100644 --- a/gcc/fortran/ChangeLog +++ b/gcc/fortran/ChangeLog @@ -1,3 +1,10 @@ +2014-11-10 Janne Blomqvist + + PR libfortran/47007 + PR libfortran/61847 + * gfortran.texi: Add note about locale issues to thread-safety + section. + 2014-11-04 Bernd Schmidt * f95-lang.c (gfc_init_builtin_functions): Use type index 2 for diff --git a/gcc/fortran/gfortran.texi b/gcc/fortran/gfortran.texi index 41d6559fab0..0d19e7a2b3a 100644 --- a/gcc/fortran/gfortran.texi +++ b/gcc/fortran/gfortran.texi @@ -1223,10 +1223,26 @@ implemented with the @code{system} function, which need not be thread-safe. It is the responsibility of the user to ensure that @code{system} is not called concurrently. -Finally, for platforms not supporting thread-safe POSIX functions, -further functionality might not be thread-safe. For details, please -consult the documentation for your operating system. - +For platforms not supporting thread-safe POSIX functions, further +functionality might not be thread-safe. For details, please consult +the documentation for your operating system. + +The GNU Fortran runtime library uses various C library functions that +depend on the locale, such as @code{strtod} and @code{snprintf}. In +order to work correctly in locale-aware programs that set the locale +using @code{setlocale}, the locale is reset to the default ``C'' +locale while executing a formatted @code{READ} or @code{WRITE} +statement. On targets supporting the POSIX 2008 per-thread locale +functions (e.g. @code{newlocale}, @code{uselocale}, +@code{freelocale}), these are used and thus the global locale set +using @code{setlocale} or the per-thread locales in other threads are +not affected. However, on targets lacking this functionality, the +global LC_NUMERIC locale is set to ``C'' during the formatted I/O. +Thus, on such targets it's not safe to call @code{setlocale} +concurrently from another thread while a Fortran formatted I/O +operation is in progress. Also, other threads doing something +dependent on the LC_NUMERIC locale might not work correctly if a +formatted I/O operation is in progress in another thread. @node Data consistency and durability @section Data consistency and durability diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog index e22600214bf..fc433b1c14c 100644 --- a/libgfortran/ChangeLog +++ b/libgfortran/ChangeLog @@ -1,3 +1,33 @@ +2014-11-10 Janne Blomqvist + + PR libfortran/47007 + PR libfortran/61847 + * config.h.in: Regenerated. + * configure: Regenerated. + * configure.ac (AC_CHECK_HEADERS_ONCE): Check for xlocale.h. + (AC_CHECK_FUNCS_ONCE): Check for newlocale, freelocale, uselocale, + strerror_l. + * io/io.h (locale.h): Include. + (xlocale.h): Include if present. + (c_locale): New variable. + (old_locale): New variable. + (old_locale_ctr): New variable. + (old_locale_lock): New variable. + (st_parameter_dt): Add old_locale member. + * io/transfer.c (data_transfer_init): Set locale to "C" if doing + formatted transfer. + (finalize_transfer): Reset locale to previous. + * io/unit.c (c_locale): New variable. + (old_locale): New variable. + (old_locale_ctr): New variable. + (old_locale_lock): New variable. + (init_units): Init c_locale, init old_locale_lock. + (close_units): Free c_locale. + * runtime/error.c (locale.h): Include. + (xlocale.h): Include if present. + (gf_strerror): Use strerror_l if available. Reset locale to + LC_GLOBAL_LOCALE for strerror_r branch. + 2014-10-20 Janne Blomqvist PR libfortran/63589 diff --git a/libgfortran/config.h.in b/libgfortran/config.h.in index b69e5b72d2e..833d8b42aad 100644 --- a/libgfortran/config.h.in +++ b/libgfortran/config.h.in @@ -429,6 +429,9 @@ /* fp_trap is present */ #undef HAVE_FP_TRAP +/* Define to 1 if you have the `freelocale' function. */ +#undef HAVE_FREELOCALE + /* Define to 1 if you have the `frexp' function. */ #undef HAVE_FREXP @@ -621,6 +624,9 @@ /* Define to 1 if you have the `mkstemp' function. */ #undef HAVE_MKSTEMP +/* Define to 1 if you have the `newlocale' function. */ +#undef HAVE_NEWLOCALE + /* Define to 1 if you have the `nextafter' function. */ #undef HAVE_NEXTAFTER @@ -723,6 +729,9 @@ /* Define to 1 if you have the `strcasestr' function. */ #undef HAVE_STRCASESTR +/* Define to 1 if you have the `strerror_l' function. */ +#undef HAVE_STRERROR_L + /* Define if strerror_r is available in . */ #undef HAVE_STRERROR_R @@ -840,6 +849,9 @@ /* Define if target can unlink open files. */ #undef HAVE_UNLINK_OPEN_FILE +/* Define to 1 if you have the `uselocale' function. */ +#undef HAVE_USELOCALE + /* Define to 1 if you have the `vsnprintf' function. */ #undef HAVE_VSNPRINTF @@ -849,6 +861,9 @@ /* Define if target has a reliable stat. */ #undef HAVE_WORKING_STAT +/* Define to 1 if you have the header file. */ +#undef HAVE_XLOCALE_H + /* Define to 1 if you have the `y0' function. */ #undef HAVE_Y0 diff --git a/libgfortran/configure b/libgfortran/configure index df1782929ac..e75fbffcb96 100755 --- a/libgfortran/configure +++ b/libgfortran/configure @@ -2549,6 +2549,7 @@ as_fn_append ac_header_list " fptrap.h" as_fn_append ac_header_list " fpxcp.h" as_fn_append ac_header_list " pwd.h" as_fn_append ac_header_list " complex.h" +as_fn_append ac_header_list " xlocale.h" as_fn_append ac_func_list " getrusage" as_fn_append ac_func_list " times" as_fn_append ac_func_list " mkstemp" @@ -2605,6 +2606,10 @@ as_fn_append ac_func_list " mkostemp" as_fn_append ac_func_list " strnlen" as_fn_append ac_func_list " strndup" as_fn_append ac_func_list " strtok_r" +as_fn_append ac_func_list " newlocale" +as_fn_append ac_func_list " freelocale" +as_fn_append ac_func_list " uselocale" +as_fn_append ac_func_list " strerror_l" as_fn_append ac_header_list " math.h" # Check that the precious variables saved in the cache have kept the same # value. @@ -12350,7 +12355,7 @@ else lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2 lt_status=$lt_dlunknown cat > conftest.$ac_ext <<_LT_EOF -#line 12353 "configure" +#line 12358 "configure" #include "confdefs.h" #if HAVE_DLFCN_H @@ -12456,7 +12461,7 @@ else lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2 lt_status=$lt_dlunknown cat > conftest.$ac_ext <<_LT_EOF -#line 12459 "configure" +#line 12464 "configure" #include "confdefs.h" #if HAVE_DLFCN_H @@ -16016,6 +16021,8 @@ done + + @@ -16618,6 +16625,14 @@ done + + + + + + + + diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac index b3150f49c99..f54104bb460 100644 --- a/libgfortran/configure.ac +++ b/libgfortran/configure.ac @@ -255,7 +255,7 @@ AC_CHECK_TYPES([ptrdiff_t]) # check header files (we assume C89 is available, so don't check for that) AC_CHECK_HEADERS_ONCE(unistd.h sys/time.h sys/times.h sys/resource.h \ sys/types.h sys/stat.h sys/wait.h floatingpoint.h ieeefp.h fenv.h fptrap.h \ -fpxcp.h pwd.h complex.h) +fpxcp.h pwd.h complex.h xlocale.h) GCC_HEADER_STDINT(gstdint.h) @@ -290,7 +290,8 @@ else strcasestr getrlimit gettimeofday stat fstat lstat getpwuid vsnprintf dup \ getcwd localtime_r gmtime_r getpwuid_r ttyname_r clock_gettime \ readlink getgid getpid getppid getuid geteuid umask getegid \ - secure_getenv __secure_getenv mkostemp strnlen strndup strtok_r) + secure_getenv __secure_getenv mkostemp strnlen strndup strtok_r newlocale \ + freelocale uselocale strerror_l) fi # Check strerror_r, cannot be above as versions with two and three arguments exist diff --git a/libgfortran/io/io.h b/libgfortran/io/io.h index 1e0d092976d..a75177f894f 100644 --- a/libgfortran/io/io.h +++ b/libgfortran/io/io.h @@ -32,6 +32,17 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #include + +/* POSIX 2008 specifies that the extended locale stuff is found in + locale.h, but some systems have them in xlocale.h. */ + +#include + +#ifdef HAVE_XLOCALE_H +#include +#endif + + /* Forward declarations. */ struct st_parameter_dt; typedef struct stream stream; @@ -40,6 +51,19 @@ struct format_data; typedef struct fnode fnode; struct gfc_unit; +#ifdef HAVE_NEWLOCALE +/* We have POSIX 2008 extended locale stuff. */ +extern locale_t c_locale; +internal_proto(c_locale); +#else +extern char* old_locale; +internal_proto(old_locale); +extern int old_locale_ctr; +internal_proto(old_locale_ctr); +extern __gthread_mutex_t old_locale_lock; +internal_proto(old_locale_lock); +#endif + /* Macros for testing what kinds of I/O we are doing. */ @@ -450,6 +474,9 @@ typedef struct st_parameter_dt char *line_buffer; struct format_data *fmt; namelist_info *ionml; +#ifdef HAVE_NEWLOCALE + locale_t old_locale; +#endif /* Current position within the look-ahead line buffer. */ int line_buffer_pos; /* Storage area for values except for strings. Must be diff --git a/libgfortran/io/transfer.c b/libgfortran/io/transfer.c index dc1b6f4145a..87b8c05c1a4 100644 --- a/libgfortran/io/transfer.c +++ b/libgfortran/io/transfer.c @@ -2870,13 +2870,27 @@ data_transfer_init (st_parameter_dt *dtp, int read_flag) dtp->u.p.current_unit->read_bad = 1; } - /* Start the data transfer if we are doing a formatted transfer. */ - if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED - && ((cf & (IOPARM_DT_LIST_FORMAT | IOPARM_DT_HAS_NAMELIST_NAME)) == 0) - && dtp->u.p.ionml == NULL) - formatted_transfer (dtp, 0, NULL, 0, 0, 1); + if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED) + { +#ifdef HAVE_USELOCALE + dtp->u.p.old_locale = uselocale (c_locale); +#else + __gthread_mutex_lock (&old_locale_lock); + if (!old_locale_ctr++) + { + old_locale = setlocale (LC_NUMERIC, NULL); + setlocale (LC_NUMERIC, "C"); + } + __gthread_mutex_unlock (&old_locale_lock); +#endif + /* Start the data transfer if we are doing a formatted transfer. */ + if ((cf & (IOPARM_DT_LIST_FORMAT | IOPARM_DT_HAS_NAMELIST_NAME)) == 0 + && dtp->u.p.ionml == NULL) + formatted_transfer (dtp, 0, NULL, 0, 0, 1); + } } + /* Initialize an array_loop_spec given the array descriptor. The function returns the index of the last element of the array, and also returns starting record, where the first I/O goes to (necessary in case of @@ -3531,14 +3545,14 @@ finalize_transfer (st_parameter_dt *dtp) if (dtp->u.p.eor_condition) { generate_error (&dtp->common, LIBERROR_EOR, NULL); - return; + goto done; } if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK) { if (dtp->u.p.current_unit && current_mode (dtp) == UNFORMATTED_SEQUENTIAL) dtp->u.p.current_unit->current_record = 0; - return; + goto done; } if ((dtp->u.p.ionml != NULL) @@ -3552,12 +3566,12 @@ finalize_transfer (st_parameter_dt *dtp) dtp->u.p.transfer = NULL; if (dtp->u.p.current_unit == NULL) - return; + goto done; if ((cf & IOPARM_DT_LIST_FORMAT) != 0 && dtp->u.p.mode == READING) { finish_list_read (dtp); - return; + goto done; } if (dtp->u.p.mode == WRITING) @@ -3570,7 +3584,7 @@ finalize_transfer (st_parameter_dt *dtp) && dtp->u.p.advance_status != ADVANCE_NO) next_record (dtp, 1); - return; + goto done; } dtp->u.p.current_unit->current_record = 0; @@ -3579,7 +3593,7 @@ finalize_transfer (st_parameter_dt *dtp) { fbuf_flush (dtp->u.p.current_unit, dtp->u.p.mode); dtp->u.p.seen_dollar = 0; - return; + goto done; } /* For non-advancing I/O, save the current maximum position for use in the @@ -3591,7 +3605,7 @@ finalize_transfer (st_parameter_dt *dtp) dtp->u.p.current_unit->saved_pos = dtp->u.p.max_pos > 0 ? dtp->u.p.max_pos - bytes_written : 0; fbuf_flush (dtp->u.p.current_unit, dtp->u.p.mode); - return; + goto done; } else if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED && dtp->u.p.mode == WRITING && !is_internal_unit (dtp)) @@ -3600,6 +3614,23 @@ finalize_transfer (st_parameter_dt *dtp) dtp->u.p.current_unit->saved_pos = 0; next_record (dtp, 1); + + done: +#ifdef HAVE_USELOCALE + if (dtp->u.p.old_locale != (locale_t) 0) + { + uselocale (dtp->u.p.old_locale); + dtp->u.p.old_locale = (locale_t) 0; + } +#else + __gthread_mutex_lock (&old_locale_lock); + if (!--old_locale_ctr) + { + setlocale (LC_NUMERIC, old_locale); + old_locale = NULL; + } + __gthread_mutex_unlock (&old_locale_lock); +#endif } /* Transfer function for IOLENGTH. It doesn't actually do any diff --git a/libgfortran/io/unit.c b/libgfortran/io/unit.c index 2a31e55bc30..277c7a1a15f 100644 --- a/libgfortran/io/unit.c +++ b/libgfortran/io/unit.c @@ -90,6 +90,26 @@ static char stdin_name[] = "stdin"; static char stdout_name[] = "stdout"; static char stderr_name[] = "stderr"; + +#ifdef HAVE_NEWLOCALE +locale_t c_locale; +#else +/* If we don't have POSIX 2008 per-thread locales, we need to use the + traditional setlocale(). To prevent multiple concurrent threads + doing formatted I/O from messing up the locale, we need to store a + global old_locale, and a counter keeping track of how many threads + are currently doing formatted I/O. The first thread saves the old + locale, and the last one restores it. */ +char *old_locale; +int old_locale_ctr; +#ifdef __GTHREAD_MUTEX_INIT +__gthread_mutex_t old_locale_lock = __GTHREAD_MUTEX_INIT; +#else +__gthread_mutex_t old_locale_lock; +#endif +#endif + + /* This implementation is based on Stefan Nilsson's article in the * July 1997 Doctor Dobb's Journal, "Treaps in Java". */ @@ -561,6 +581,14 @@ init_units (void) gfc_unit *u; unsigned int i; +#ifdef HAVE_NEWLOCALE + c_locale = newlocale (0, "C", 0); +#else +#ifndef __GTHREAD_MUTEX_INIT + __GTHREAD_MUTEX_INIT_FUNCTION (&old_locale_lock); +#endif +#endif + #ifndef __GTHREAD_MUTEX_INIT __GTHREAD_MUTEX_INIT_FUNCTION (&unit_lock); #endif @@ -736,6 +764,10 @@ close_units (void) while (unit_root != NULL) close_unit_1 (unit_root, 1); __gthread_mutex_unlock (&unit_lock); + +#ifdef HAVE_FREELOCALE + freelocale (c_locale); +#endif } diff --git a/libgfortran/runtime/error.c b/libgfortran/runtime/error.c index 4bde33ba723..7a3a1b744ed 100644 --- a/libgfortran/runtime/error.c +++ b/libgfortran/runtime/error.c @@ -46,6 +46,13 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #endif +#include + +#ifdef HAVE_XLOCALE_H +#include +#endif + + #ifdef __MINGW32__ #define HAVE_GETPID 1 #include @@ -204,14 +211,26 @@ gfc_xtoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len) } -/* Hopefully thread-safe wrapper for a strerror_r() style function. */ +/* Hopefully thread-safe wrapper for a strerror() style function. */ char * gf_strerror (int errnum, char * buf __attribute__((unused)), size_t buflen __attribute__((unused))) { -#ifdef HAVE_STRERROR_R +#ifdef HAVE_STRERROR_L + locale_t myloc = newlocale (LC_CTYPE_MASK | LC_MESSAGES_MASK, "", + (locale_t) 0); + char *p = strerror_l (errnum, myloc); + freelocale (myloc); + return p; +#elif defined(HAVE_STRERROR_R) +#ifdef HAVE_USELOCALE + /* Some targets (Darwin at least) have the POSIX 2008 extended + locale functions, but not strerror_l. So reset the per-thread + locale here. */ + uselocale (LC_GLOBAL_LOCALE); +#endif /* POSIX returns an "int", GNU a "char*". */ return __builtin_choose_expr (__builtin_classify_type (strerror_r (0, buf, 0)) -- 2.30.2