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Commit c85162b1 authored by marko's avatar marko
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Port r106 from branches/5.0: 

Protect the increment and decrement operations on the statistic variables
os_n_pending_writes and os_n_pending_reads with os_file_count_mutex.
parent 7d3e9fd6
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Showing with 66 additions and 38 deletions
os/os0file.c
View file @ c85162b1
......@@ -160,15 +160,12 @@ time_t os_last_printout;
ibool os_has_said_disk_full = FALSE;
/* The mutex protecting the following counts of pending pread and pwrite
operations */
/* The mutex protecting the following counts of pending I/O operations */
static os_mutex_t os_file_count_mutex;
ulint os_file_n_pending_preads = 0;
ulint os_file_n_pending_pwrites = 0;
/* These are not protected by any mutex */
ulint os_n_pending_writes = 0;
ulint os_n_pending_reads = 0;
ulint os_n_pending_writes = 0;
ulint os_n_pending_reads = 0;
/***************************************************************************
Gets the operating system version. Currently works only on Windows. */
......@@ -1905,12 +1902,14 @@ os_file_pread(
#if defined(HAVE_PREAD) && !defined(HAVE_BROKEN_PREAD)
os_mutex_enter(os_file_count_mutex);
os_file_n_pending_preads++;
os_n_pending_reads++;
os_mutex_exit(os_file_count_mutex);
n_bytes = pread(file, buf, (ssize_t)n, offs);
os_mutex_enter(os_file_count_mutex);
os_file_n_pending_preads--;
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
return(n_bytes);
......@@ -1920,6 +1919,10 @@ os_file_pread(
ssize_t ret;
ulint i;
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads++;
os_mutex_exit(os_file_count_mutex);
/* Protect the seek / read operation with a mutex */
i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
......@@ -1928,15 +1931,17 @@ os_file_pread(
ret_offset = lseek(file, offs, SEEK_SET);
if (ret_offset < 0) {
os_mutex_exit(os_file_seek_mutexes[i]);
return(-1);
ret = -1;
} else {
ret = read(file, buf, (ssize_t)n);
}
ret = read(file, buf, (ssize_t)n);
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
return(ret);
}
#endif
......@@ -1981,12 +1986,14 @@ os_file_pwrite(
#if defined(HAVE_PWRITE) && !defined(HAVE_BROKEN_PREAD)
os_mutex_enter(os_file_count_mutex);
os_file_n_pending_pwrites++;
os_n_pending_writes++;
os_mutex_exit(os_file_count_mutex);
ret = pwrite(file, buf, (ssize_t)n, offs);
os_mutex_enter(os_file_count_mutex);
os_file_n_pending_pwrites--;
os_n_pending_writes--;
os_mutex_exit(os_file_count_mutex);
# ifdef UNIV_DO_FLUSH
......@@ -2008,6 +2015,10 @@ os_file_pwrite(
off_t ret_offset;
ulint i;
os_mutex_enter(os_file_count_mutex);
os_n_pending_writes++;
os_mutex_exit(os_file_count_mutex);
/* Protect the seek / write operation with a mutex */
i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
......@@ -2016,9 +2027,9 @@ os_file_pwrite(
ret_offset = lseek(file, offs, SEEK_SET);
if (ret_offset < 0) {
os_mutex_exit(os_file_seek_mutexes[i]);
ret = -1;
return(-1);
goto func_exit;
}
ret = write(file, buf, (ssize_t)n);
......@@ -2036,8 +2047,13 @@ os_file_pwrite(
}
# endif /* UNIV_DO_FLUSH */
func_exit:
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_writes--;
os_mutex_exit(os_file_count_mutex);
return(ret);
}
#endif
......@@ -2082,9 +2098,13 @@ try_again:
low = (DWORD) offset;
high = (DWORD) offset_high;
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads++;
os_mutex_exit(os_file_count_mutex);
/* Protect the seek / read operation with a mutex */
i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
os_mutex_enter(os_file_seek_mutexes[i]);
ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);
......@@ -2093,17 +2113,21 @@ try_again:
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
goto error_handling;
}
os_n_pending_reads++;
ret = ReadFile(file, buf, (DWORD) n, &len, NULL);
os_n_pending_reads--;
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
if (ret && len == n) {
return(TRUE);
}
......@@ -2114,12 +2138,8 @@ try_again:
os_bytes_read_since_printout += n;
try_again:
os_n_pending_reads++;
ret = os_file_pread(file, buf, n, offset, offset_high);
os_n_pending_reads--;
if ((ulint)ret == n) {
return(TRUE);
......@@ -2193,6 +2213,10 @@ try_again:
low = (DWORD) offset;
high = (DWORD) offset_high;
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads++;
os_mutex_exit(os_file_count_mutex);
/* Protect the seek / read operation with a mutex */
i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
......@@ -2204,17 +2228,21 @@ try_again:
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
goto error_handling;
}
os_n_pending_reads++;
ret = ReadFile(file, buf, (DWORD) n, &len, NULL);
os_n_pending_reads--;
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_reads--;
os_mutex_exit(os_file_count_mutex);
if (ret && len == n) {
return(TRUE);
}
......@@ -2225,12 +2253,8 @@ try_again:
os_bytes_read_since_printout += n;
try_again:
os_n_pending_reads++;
ret = os_file_pread(file, buf, n, offset, offset_high);
os_n_pending_reads--;
if ((ulint)ret == n) {
return(TRUE);
......@@ -2310,6 +2334,10 @@ retry:
low = (DWORD) offset;
high = (DWORD) offset_high;
os_mutex_enter(os_file_count_mutex);
os_n_pending_writes++;
os_mutex_exit(os_file_count_mutex);
/* Protect the seek / write operation with a mutex */
i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
......@@ -2321,6 +2349,10 @@ retry:
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_writes--;
os_mutex_exit(os_file_count_mutex);
ut_print_timestamp(stderr);
fprintf(stderr,
......@@ -2335,12 +2367,8 @@ retry:
return(FALSE);
}
os_n_pending_writes++;
ret = WriteFile(file, buf, (DWORD) n, &len, NULL);
os_n_pending_writes--;
/* Always do fsync to reduce the probability that when the OS crashes,
a database page is only partially physically written to disk. */
......@@ -2352,6 +2380,10 @@ retry:
os_mutex_exit(os_file_seek_mutexes[i]);
os_mutex_enter(os_file_count_mutex);
os_n_pending_writes--;
os_mutex_exit(os_file_count_mutex);
if (ret && len == n) {
return(TRUE);
......@@ -2402,11 +2434,7 @@ retry:
#else
ssize_t ret;
os_n_pending_writes++;
ret = os_file_pwrite(file, buf, n, offset, offset_high);
os_n_pending_writes--;
if ((ulint)ret == n) {
......
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