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lto-plugin: make claim_file_handler thread-safe

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lto-plugin/ChangeLog:

	* lto-plugin.c (plugin_lock): New lock.
	(claim_file_handler): Use mutex for critical section.
	(onload): Initialize mutex.
	* configure.ac: Check for pthread.h.
	* configure: Regenerate.
	* config.h.in: Regenerate.
This commit is contained in:
Martin Liska 2022-05-16 14:18:41 +02:00
parent 64d4f27a0c
commit 2669cae081
4 changed files with 45 additions and 2 deletions
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3
lto-plugin/config.h.in
View File

@ -9,6 +9,9 @@
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if pthread.h is present. */
#undef HAVE_PTHREAD_H
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H

17
lto-plugin/configure vendored
View File

@ -5643,6 +5643,9 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
# The plug-in depends on pthreads
LDFLAGS="-pthread"
# Check whether -static-libgcc is supported.
saved_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -static-libgcc"
@ -6010,6 +6013,16 @@ else
fi
# Check for thread headers.
ac_fn_c_check_header_mongrel "$LINENO" "pthread.h" "ac_cv_header_pthread_h" "$ac_includes_default"
if test "x$ac_cv_header_pthread_h" = xyes; then :
$as_echo "#define HAVE_PTHREAD_H 1" >>confdefs.h
fi
case `pwd` in
*\ * | *\ *)
{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Libtool does not cope well with whitespace in \`pwd\`" >&5
@ -12081,7 +12094,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 12084 "configure"
#line 12097 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -12187,7 +12200,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 12190 "configure"
#line 12203 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H

7
lto-plugin/configure.ac
View File

@ -13,6 +13,9 @@ AC_PROG_CC
AC_SYS_LARGEFILE
ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_lto_plugin_warn_cflags])
# The plug-in depends on pthreads
LDFLAGS="-pthread"
# Check whether -static-libgcc is supported.
saved_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -static-libgcc"
@ -87,6 +90,10 @@ AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER, [test "x$lto_plugin_use_symver" != xno])
AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_GNU, [test "x$lto_plugin_use_symver" = xgnu])
AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_SUN, [test "x$lto_plugin_use_symver" = xsun])
# Check for thread headers.
AC_CHECK_HEADER(pthread.h,
[AC_DEFINE(HAVE_PTHREAD_H, 1, [Define to 1 if pthread.h is present.])])
AM_PROG_LIBTOOL
ACX_LT_HOST_FLAGS
AC_SUBST(target_noncanonical)

20
lto-plugin/lto-plugin.c
View File

@ -40,7 +40,11 @@ along with this program; see the file COPYING3. If not see
#ifdef HAVE_CONFIG_H
#include "config.h"
#if !HAVE_PTHREAD_H
#error POSIX threads are mandatory dependency
#endif
#endif
#if HAVE_STDINT_H
#include <stdint.h>
#endif
@ -55,6 +59,7 @@ along with this program; see the file COPYING3. If not see
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <pthread.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
@ -157,6 +162,9 @@ enum symbol_style
ss_uscore, /* Underscore prefix all symbols. */
};
/* Plug-in mutex. */
static pthread_mutex_t plugin_lock;
static char *arguments_file_name;
static ld_plugin_register_claim_file register_claim_file;
static ld_plugin_register_all_symbols_read register_all_symbols_read;
@ -1262,15 +1270,18 @@ claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
lto_file.symtab.syms);
check (status == LDPS_OK, LDPL_FATAL, "could not add symbols");
pthread_mutex_lock (&plugin_lock);
num_claimed_files++;
claimed_files =
xrealloc (claimed_files,
num_claimed_files * sizeof (struct plugin_file_info));
claimed_files[num_claimed_files - 1] = lto_file;
pthread_mutex_unlock (&plugin_lock);
*claimed = 1;
}
pthread_mutex_lock (&plugin_lock);
if (offload_files == NULL)
{
/* Add dummy item to the start of the list. */
@ -1333,11 +1344,14 @@ claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
offload_files_last_lto = ofld;
num_offload_files++;
}
pthread_mutex_unlock (&plugin_lock);
goto cleanup;
err:
pthread_mutex_lock (&plugin_lock);
non_claimed_files++;
pthread_mutex_unlock (&plugin_lock);
free (lto_file.name);
cleanup:
@ -1415,6 +1429,12 @@ onload (struct ld_plugin_tv *tv)
struct ld_plugin_tv *p;
enum ld_plugin_status status;
if (pthread_mutex_init (&plugin_lock, NULL) != 0)
{
fprintf (stderr, "mutex init failed\n");
abort ();
}
p = tv;
while (p->tv_tag)
{