#include "sgen-thread-pool.h"
#include "sgen-client.h"
#include "mono/utils/mono-membar.h"
+#include "mono/utils/mono-proclib.h"
#include <errno.h>
#include <string.h>
}
static void
-binary_protocol_open_file (void)
+binary_protocol_open_file (gboolean assert_on_failure)
{
char *filename;
+#ifdef F_SETLK
+ struct flock lock;
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 0;
+#endif
if (file_size_limit > 0)
filename = filename_for_index (current_file_index);
filename = filename_or_prefix;
do {
- binary_protocol_file = open (filename, O_CREAT|O_WRONLY|O_TRUNC, 0644);
- if (binary_protocol_file == -1 && errno != EINTR)
- break; /* Failed */
+ binary_protocol_file = open (filename, O_CREAT | O_WRONLY, 0644);
+ if (binary_protocol_file == -1) {
+ if (errno != EINTR)
+ break; /* Failed */
+#ifdef F_SETLK
+ } else if (fcntl (binary_protocol_file, F_SETLK, &lock) == -1) {
+ /* The lock for the file is already taken. Fail */
+ close (binary_protocol_file);
+ binary_protocol_file = -1;
+ break;
+#endif
+ } else {
+ /* We have acquired the lock. Truncate the file */
+ ftruncate (binary_protocol_file, 0);
+ }
} while (binary_protocol_file == -1);
- if (binary_protocol_file == -1)
+ if (binary_protocol_file == -1 && assert_on_failure)
g_error ("sgen binary protocol: failed to open file");
if (file_size_limit > 0)
binary_protocol_init (const char *filename, long long limit)
{
#ifdef HAVE_UNISTD_H
- filename_or_prefix = (char *)sgen_alloc_internal_dynamic (strlen (filename) + 1, INTERNAL_MEM_BINARY_PROTOCOL, TRUE);
- strcpy (filename_or_prefix, filename);
-
file_size_limit = limit;
- binary_protocol_open_file ();
+ /* Original name length + . + pid length in hex + null terminator */
+ filename_or_prefix = g_strdup_printf ("%s", filename);
+ binary_protocol_open_file (FALSE);
+
+ if (binary_protocol_file == -1) {
+ /* Another process owns the file, try adding the pid suffix to the filename */
+ gint32 pid = mono_process_current_pid ();
+ g_free (filename_or_prefix);
+ filename_or_prefix = g_strdup_printf ("%s.%x", filename, pid);
+ binary_protocol_open_file (TRUE);
+ }
+
+ /* If we have a file size limit, we might need to open additional files */
+ if (file_size_limit == 0)
+ g_free (filename_or_prefix);
binary_protocol_header (PROTOCOL_HEADER_CHECK, PROTOCOL_HEADER_VERSION, SIZEOF_VOID_P, G_BYTE_ORDER == G_LITTLE_ENDIAN);
#else
++current_file_index;
current_file_size = 0;
- binary_protocol_open_file ();
+ binary_protocol_open_file (TRUE);
}
#endif