logger context add field: use_file_write_lock

HISTORY

@@ -3,6 +3,7 @@ Version 1.31  2016-11-13
   * move SET_SOCKOPT_NOSIGPIPE from sockopt.c to sockopt.h
   * add function get_time_item_from_str
   * add file trylock functions
+  * logger context add field: use_file_write_lock
 
 Version 1.30  2016-10-31
   * modify php-fastcommon/test.php

src/logger.c

@@ -114,33 +114,40 @@ static int log_print_header(LogContext *pContext)
 {
     int result;
 
-    if ((result=file_write_lock(pContext->log_fd)) != 0)
+    if (!pContext->use_file_write_lock)
     {
-        return result;
+        if ((result=file_write_lock(pContext->log_fd)) != 0)
+        {
+            return result;
+        }
     }
 
     pContext->current_size = lseek(pContext->log_fd, 0, SEEK_END);
     if (pContext->current_size < 0)
     {
         result = errno != 0 ? errno : EACCES;
-        file_unlock(pContext->log_fd);
-
         fprintf(stderr, "lseek file \"%s\" fail, " \
                 "errno: %d, error info: %s\n", \
                 pContext->log_filename, result, STRERROR(result));
-        return result;
     }
-    if (pContext->current_size == 0)
-    {
-        pContext->print_header_callback(pContext);
+    else {
+        result = 0;
+        if (pContext->current_size == 0) {
+            pContext->print_header_callback(pContext);
+        }
     }
-    file_unlock(pContext->log_fd);
 
-    return 0;
+    if (!pContext->use_file_write_lock)
+    {
+        file_unlock(pContext->log_fd);
+    }
+
+    return result;
 }
 
 static int log_open(LogContext *pContext)
 {
+    int result;
 	if ((pContext->log_fd = open(pContext->log_filename, O_WRONLY | \
 				O_CREAT | O_APPEND | pContext->fd_flags, 0644)) < 0)
 	{
@@ -151,6 +158,14 @@ static int log_open(LogContext *pContext)
 		return errno != 0 ? errno : EACCES;
 	}
 
+    if (pContext->use_file_write_lock) {
+        if ((result=file_try_write_lock(pContext->log_fd)) != 0) {
+            close(pContext->log_fd);
+            pContext->log_fd = STDERR_FILENO;
+            return result;
+        }
+    }
+
     if (pContext->take_over_stderr) {
         if (dup2(pContext->log_fd, STDERR_FILENO) < 0) {
             fprintf(stderr, "file: "__FILE__", line: %d, "
@@ -229,6 +244,11 @@ void log_set_cache_ex(LogContext *pContext, const bool bLogCache)
 	pContext->log_to_cache = bLogCache;
 }
 
+void log_set_use_file_write_lock_ex(LogContext *pContext, const bool use_lock)
+{
+	pContext->use_file_write_lock = use_lock;
+}
+
 void log_set_time_precision(LogContext *pContext, const int time_precision)
 {
 	pContext->time_precision = time_precision;

src/logger.h

@@ -76,6 +76,9 @@ typedef struct log_context
 	/* time precision */
 	char time_precision;
 
+    /* if use file write lock */
+    bool use_file_write_lock;
+
     /* compress the log file use gzip command */
     short compress_log_flags;
 
@@ -134,6 +137,9 @@ int log_init2();
 #define log_set_compress_log_days_before(days_before) \
     log_set_compress_log_days_before_ex(&g_log_context, days_before)
 
+#define log_set_use_file_write_lock(use_lock)  \
+    log_set_use_file_write_lock_ex(&g_log_context, use_lock)
+
 #define log_header(pContext, header, header_len) \
     log_it_ex2(pContext, NULL, header, header_len, false, false)
 
@@ -180,6 +186,14 @@ int log_set_filename_ex(LogContext *pContext, const char *log_filename);
 */
 void log_set_cache_ex(LogContext *pContext, const bool bLogCache);
 
+/** set if use file write lock
+ *  parameters:
+ *           pContext: the log context
+ *           use_lock: true for use write lock, false NOT use write lock
+ *  return: none
+*/
+void log_set_use_file_write_lock_ex(LogContext *pContext, const bool use_lock);
+
 /** set time precision
  *  parameters:
  *           pContext: the log context

src/tests/test_ini_parser.c

@@ -18,6 +18,15 @@ int main(int argc, char *argv[])
 	
 	log_init();
 	g_log_context.log_level = LOG_DEBUG;
+    log_take_over_stderr();
+    log_take_over_stdout();
+    log_set_compress_log_flags(LOG_COMPRESS_FLAGS_ENABLED | LOG_COMPRESS_FLAGS_NEW_THREAD);
+    
+    printf("sizeof(LogContext): %d, time_precision: %d, compress_log_flags: %d, "
+            "use_file_write_lock: %d\n", (int)sizeof(LogContext),
+            g_log_context.time_precision,
+            g_log_context.compress_log_flags,
+            g_log_context.use_file_write_lock);
 
     if ((result=iniLoadFromFile(szFilename, &context)) != 0)
     {