Skip to content

Thread safe locale #44

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Thread safe locale #44

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
68 changes: 53 additions & 15 deletions svm.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,13 @@
#include <stdarg.h>
#include <limits.h>
#include <locale.h>

#if __unix__
# include <unistd.h> // For _POSIX_VERSION
#endif

#include "svm.h"

int libsvm_version = LIBSVM_VERSION;
typedef float Qfloat;
typedef signed char schar;
Expand Down Expand Up @@ -2638,16 +2644,55 @@ static const char *kernel_type_table[]=
"linear","polynomial","rbf","sigmoid","precomputed",NULL
};

int svm_save_model(const char *model_file_name, const svm_model *model)
#if _POSIX_VERSION >= 200809L

// If possible, use the thread-safe uselocale() function
typedef locale_t locale_handle;

static locale_handle set_c_locale()
{
FILE *fp = fopen(model_file_name,"w");
if(fp==NULL) return -1;
locale_handle c_locale = newlocale(LC_ALL_MASK, "C", 0);
locale_handle old_locale = uselocale(c_locale);
return old_locale;
}

static void restore_locale(locale_handle locale)
{
locale_handle c_locale = uselocale(locale);
if (c_locale && c_locale != LC_GLOBAL_LOCALE) {
freelocale(c_locale);
}
}

#else

// But fall back to setlocale() if uselocale() is not available
typedef char *locale_handle;

char *old_locale = setlocale(LC_ALL, NULL);
static locale_handle set_c_locale()
{
locale_handle old_locale = setlocale(LC_ALL, NULL);
if (old_locale) {
old_locale = strdup(old_locale);
}
setlocale(LC_ALL, "C");
return old_locale;
}

static void restore_locale(locale_handle locale)
{
setlocale(LC_ALL, locale);
free(locale);
}

#endif

int svm_save_model(const char *model_file_name, const svm_model *model)
{
FILE *fp = fopen(model_file_name,"w");
if(fp==NULL) return -1;

locale_handle old_locale = set_c_locale();

const svm_parameter& param = model->param;

Expand Down Expand Up @@ -2728,8 +2773,7 @@ int svm_save_model(const char *model_file_name, const svm_model *model)
fprintf(fp, "\n");
}

setlocale(LC_ALL, old_locale);
free(old_locale);
restore_locale(old_locale);

if (ferror(fp) != 0 || fclose(fp) != 0) return -1;
else return 0;
Expand Down Expand Up @@ -2878,11 +2922,7 @@ svm_model *svm_load_model(const char *model_file_name)
FILE *fp = fopen(model_file_name,"rb");
if(fp==NULL) return NULL;

char *old_locale = setlocale(LC_ALL, NULL);
if (old_locale) {
old_locale = strdup(old_locale);
}
setlocale(LC_ALL, "C");
locale_handle old_locale = set_c_locale();

// read parameters

Expand All @@ -2898,8 +2938,7 @@ svm_model *svm_load_model(const char *model_file_name)
if (!read_model_header(fp, model))
{
fprintf(stderr, "ERROR: fscanf failed to read model\n");
setlocale(LC_ALL, old_locale);
free(old_locale);
restore_locale(old_locale);
free(model->rho);
free(model->label);
free(model->nSV);
Expand Down Expand Up @@ -2971,8 +3010,7 @@ svm_model *svm_load_model(const char *model_file_name)
}
free(line);

setlocale(LC_ALL, old_locale);
free(old_locale);
restore_locale(old_locale);

if (ferror(fp) != 0 || fclose(fp) != 0)
return NULL;
Expand Down