Merged revisions 63445 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r63445 | russell | 2007-05-08 11:30:43 -0500 (Tue, 08 May 2007) | 2 lines

Use a read/write lock when accessing the built-in features.

........

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@63446 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_features.c b/res/res_features.c
index 8a411c09601c5fc3a8c9d963ab91399a1d13c580..7177df0d51abcd8ceb7c86bcce278b0203204915 100644 (file)
--- a/res/res_features.c
+++ b/res/res_features.c
@@ -1004,7 +1004,9 @@ static int builtin_atxfer(struct ast_channel *chan, struct ast_channel *peer, st
 /* add atxfer and automon as undefined so you can only use em if you configure them */
 #define FEATURES_COUNT ARRAY_LEN(builtin_features)
 
-struct ast_call_feature builtin_features[] = 
+AST_RWLOCK_DEFINE_STATIC(features_lock);
+
+static struct ast_call_feature builtin_features[] = 
  {
        { AST_FEATURE_REDIRECT, "Blind Transfer", "blindxfer", "#", "#", builtin_blindtransfer, AST_FEATURE_FLAG_NEEDSDTMF, "" },
        { AST_FEATURE_REDIRECT, "Attended Transfer", "atxfer", "", "", builtin_atxfer, AST_FEATURE_FLAG_NEEDSDTMF, "" },
@@ -1056,16 +1058,14 @@ static void ast_unregister_features(void)
 }
 
 /*! \brief find a call feature by name */
-static struct ast_call_feature *find_feature(char *name)
+static struct ast_call_feature *find_feature(const char *name)
 {
        struct ast_call_feature *tmp;
 
-       AST_LIST_LOCK(&feature_list);
        AST_LIST_TRAVERSE(&feature_list, tmp, feature_entry) {
                if (!strcasecmp(tmp->sname, name))
                        break;
        }
-       AST_LIST_UNLOCK(&feature_list);
 
        return tmp;
 }
@@ -1154,23 +1154,25 @@ static int feature_exec_app(struct ast_channel *chan, struct ast_channel *peer,
 static void unmap_features(void)
 {
        int x;
+
+       ast_rwlock_wrlock(&features_lock);
        for (x = 0; x < FEATURES_COUNT; x++)
                strcpy(builtin_features[x].exten, builtin_features[x].default_exten);
+       ast_rwlock_unlock(&features_lock);
 }
 
 static int remap_feature(const char *name, const char *value)
 {
-       int x;
        int res = -1;
-       for (x = 0; x < FEATURES_COUNT; x++) {
-               if (!strcasecmp(name, builtin_features[x].sname)) {
-                       ast_copy_string(builtin_features[x].exten, value, sizeof(builtin_features[x].exten));
-                       if (option_verbose > 1)
-                               ast_verbose(VERBOSE_PREFIX_2 "Remapping feature %s (%s) to sequence '%s'\n", builtin_features[x].fname, builtin_features[x].sname, builtin_features[x].exten);
-                       res = 0;
-               } else if (!strcmp(value, builtin_features[x].exten)) 
-                       ast_log(LOG_WARNING, "Sequence '%s' already mapped to function %s (%s) while assigning to %s\n", value, builtin_features[x].fname, builtin_features[x].sname, name);
+       struct ast_call_feature *feature;
+
+       ast_rwlock_wrlock(&features_lock);
+       if ((feature = find_feature(name))) {
+               ast_copy_string(feature->exten, value, sizeof(feature->exten));
+               res = 0;
        }
+       ast_rwlock_unlock(&features_lock);
+
        return res;
 }
 
@@ -1181,6 +1183,7 @@ static int ast_feature_interpret(struct ast_channel *chan, struct ast_channel *p
        int res = FEATURE_RETURN_PASSDIGITS;
        struct ast_call_feature *feature;
        const char *dynamic_features=pbx_builtin_getvar_helper(chan,"DYNAMIC_FEATURES");
+       char *tmp, *tok;
 
        if (sense == FEATURE_SENSE_CHAN)
                ast_copy_flags(&features, &(config->features_caller), AST_FLAGS_ALL);   
@@ -1189,7 +1192,8 @@ static int ast_feature_interpret(struct ast_channel *chan, struct ast_channel *p
        if (option_debug > 2)
                ast_log(LOG_DEBUG, "Feature interpret: chan=%s, peer=%s, sense=%d, features=%d\n", chan->name, peer->name, sense, features.flags);
 
-       for (x=0; x < FEATURES_COUNT; x++) {
+       ast_rwlock_rdlock(&features_lock);
+       for (x = 0; x < FEATURES_COUNT; x++) {
                if ((ast_test_flag(&features, builtin_features[x].feature_mask)) &&
                    !ast_strlen_zero(builtin_features[x].exten)) {
                        /* Feature is up for consideration */
@@ -1202,27 +1206,31 @@ static int ast_feature_interpret(struct ast_channel *chan, struct ast_channel *p
                        }
                }
        }
+       ast_rwlock_unlock(&features_lock);
 
+       if (ast_strlen_zero(dynamic_features))
+               return res;
 
-       if (!ast_strlen_zero(dynamic_features)) {
-               char *tmp = ast_strdupa(dynamic_features);
-               char *tok;
+       tmp = ast_strdupa(dynamic_features);
 
-               while ((tok = strsep(&tmp, "#")) != NULL) {
-                       feature = find_feature(tok);
-                       
-                       if (feature) {
-                               /* Feature is up for consideration */
-                               if (!strcmp(feature->exten, code)) {
-                                       if (option_verbose > 2)
-                                               ast_verbose(VERBOSE_PREFIX_3 " Feature Found: %s exten: %s\n",feature->sname, tok);
-                                       res = feature->operation(chan, peer, config, code, sense);
-                                       break;
-                               } else if (!strncmp(feature->exten, code, strlen(code))) {
-                                       res = FEATURE_RETURN_STOREDIGITS;
-                               }
-                       }
+       while ((tok = strsep(&tmp, "#"))) {
+               ast_rwlock_rdlock(&features_lock);
+               if (!(feature = find_feature(tok))) {
+                       ast_rwlock_unlock(&features_lock);
+                       continue;
                }
+                       
+               /* Feature is up for consideration */
+               if (!strcmp(feature->exten, code)) {
+                       if (option_verbose > 2)
+                               ast_verbose(VERBOSE_PREFIX_3 " Feature Found: %s exten: %s\n",feature->sname, tok);
+                       res = feature->operation(chan, peer, config, code, sense);
+                       ast_rwlock_unlock(&features_lock);
+                       break;
+               } else if (!strncmp(feature->exten, code, strlen(code)))
+                       res = FEATURE_RETURN_STOREDIGITS;
+
+               ast_rwlock_unlock(&features_lock);
        }
        
        return res;
@@ -1232,16 +1240,20 @@ static void set_config_flags(struct ast_channel *chan, struct ast_channel *peer,
 {
        int x;
        
-       ast_clear_flag(config, AST_FLAGS_ALL);  
+       ast_clear_flag(config, AST_FLAGS_ALL);
+
+       ast_rwlock_rdlock(&features_lock);
        for (x = 0; x < FEATURES_COUNT; x++) {
-               if (ast_test_flag(builtin_features + x, AST_FEATURE_FLAG_NEEDSDTMF)) {
-                       if (ast_test_flag(&(config->features_caller), builtin_features[x].feature_mask))
-                               ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
+               if (!ast_test_flag(builtin_features + x, AST_FEATURE_FLAG_NEEDSDTMF))
+                       continue;
 
-                       if (ast_test_flag(&(config->features_callee), builtin_features[x].feature_mask))
-                               ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
-               }
+               if (ast_test_flag(&(config->features_caller), builtin_features[x].feature_mask))
+                       ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
+
+               if (ast_test_flag(&(config->features_callee), builtin_features[x].feature_mask))
+                       ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
        }
+       ast_rwlock_unlock(&features_lock);
        
        if (chan && peer && !(ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_0) && ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_1))) {
                const char *dynamic_features = pbx_builtin_getvar_helper(chan, "DYNAMIC_FEATURES");
@@ -1253,12 +1265,14 @@ static void set_config_flags(struct ast_channel *chan, struct ast_channel *peer,
 
                        /* while we have a feature */
                        while ((tok = strsep(&tmp, "#"))) {
+                               ast_rwlock_rdlock(&features_lock);
                                if ((feature = find_feature(tok)) && ast_test_flag(feature, AST_FEATURE_FLAG_NEEDSDTMF)) {
                                        if (ast_test_flag(feature, AST_FEATURE_FLAG_BYCALLER))
                                                ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
                                        if (ast_test_flag(feature, AST_FEATURE_FLAG_BYCALLEE))
                                                ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
                                }
+                               ast_rwlock_unlock(&features_lock);
                        }
                }
        }
@@ -1294,7 +1308,8 @@ static struct ast_channel *ast_feature_request_and_dial(struct ast_channel *call
 
                        ast_indicate(caller, AST_CONTROL_RINGING);
                        /* support dialing of the featuremap disconnect code while performing an attended tranfer */
-                       for (x=0; x < FEATURES_COUNT; x++) {
+                       ast_rwlock_rdlock(&features_lock);
+                       for (x = 0; x < FEATURES_COUNT; x++) {
                                if (strcasecmp(builtin_features[x].sname, "disconnect"))
                                        continue;
 
@@ -1304,6 +1319,7 @@ static struct ast_channel *ast_feature_request_and_dial(struct ast_channel *call
                                memset(dialed_code, 0, len);
                                break;
                        }
+                       ast_rwlock_unlock(&features_lock);
                        x = 0;
                        started = ast_tvnow();
                        to = timeout;
@@ -2073,7 +2089,6 @@ static int park_exec(struct ast_channel *chan, void *data)
 static int handle_showfeatures(int fd, int argc, char *argv[])
 {
        int i;
-       int fcount;
        struct ast_call_feature *feature;
        char format[] = "%-25s %-7s %-7s\n";
 
@@ -2082,23 +2097,20 @@ static int handle_showfeatures(int fd, int argc, char *argv[])
 
        ast_cli(fd, format, "Pickup", "*8", ast_pickup_ext());          /* default hardcoded above, so we'll hardcode it here */
 
-       fcount = sizeof(builtin_features) / sizeof(builtin_features[0]);
-
-       for (i = 0; i < fcount; i++)
-       {
+       ast_rwlock_rdlock(&features_lock);
+       for (i = 0; i < FEATURES_COUNT; i++)
                ast_cli(fd, format, builtin_features[i].fname, builtin_features[i].default_exten, builtin_features[i].exten);
-       }
+       ast_rwlock_unlock(&features_lock);
+
        ast_cli(fd, "\n");
        ast_cli(fd, format, "Dynamic Feature", "Default", "Current");
        ast_cli(fd, format, "---------------", "-------", "-------");
-       if (AST_LIST_EMPTY(&feature_list)) {
+       if (AST_LIST_EMPTY(&feature_list))
                ast_cli(fd, "(none)\n");
-       }
        else {
                AST_LIST_LOCK(&feature_list);
-               AST_LIST_TRAVERSE(&feature_list, feature, feature_entry) {
+               AST_LIST_TRAVERSE(&feature_list, feature, feature_entry)
                        ast_cli(fd, format, feature->sname, "no def", feature->exten);  
-               }
                AST_LIST_UNLOCK(&feature_list);
        }
        ast_cli(fd, "\nCall parking\n");