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--- cookbooks:devel:core [2020/11/11 09:37]
miconda [loadpath]
+++ cookbooks:devel:core [2020/11/26 16:28]
miconda [async_workers]
@@ Line 359: / Line 359: @@
     * text on the same line as the directive will cause problems. Keep the directive lines clean and only comment on a line before or after.
+==== defenv ====
+Preprocessor directive to define an ID to the value of an environment variable with the name ENVVAR.
+<code c>
+#!defenv ID=ENVVAR
+</code>
+It can also be just **$!defenv ENVVAR** and the defined ID is the ENVVAR name.
+Example:
+<code c>
+#!defenv SHELL
+</code>
+If environment variable $SHELL is '/bin/bash', then it is like:
+<code c>
+#!define SHELL /bin/bash
+</code>
+Full expression variant:
+<code c>
+#!defenv ENVSHELL=SHELL
+</code>
+Then it is like:
+<code c>
+#!define ENVSHELL /bin/bash
+</code>
+It is a simplified alternative of using **#!substdef** with **$env(NAME)** in the replacement part.
 ==== subst ====
@@ Line 728: / Line 764: @@
 ==== async_workers ====
-Specify how many child processes to create for asynchronous execution. These are processes that can receive tasks from various components and execute them locally, which is different process than the task sender.
+Specify how many child processes to create for asynchronous execution in the group "default". These are processes that can receive tasks from various components (e.g, modules such as async, acc, sqlops) and execute them locally, which is different process than the task sender.
 Default: 0 (asynchronous framework is disabled).
@@ Line 737: / Line 773: @@
     async_workers=4
 </code>
+==== async_workers_group ====
+Define groups of asynchronous worker processes.
+Prototype:
+<code>
+async_workers_group="name=X;workers=N;nonblock=[0|1];usleep=M"
+</code>
+The attributes are:
+  * **name** - the group name (used by functions such as **sworker_task(name)**)
+  * **workers** - the number of processes to create for this group
+  * **nonblock** - set or not set the non-block flag for internal communication socket
+  * **usleep** - the number of microseconds to sleep before trying to receive next task (can be useful if nonblock=1)
+Default: "".
+Example:
+<code>
+    async_workers_group="name=reg;workers=4;nonblock=0;usleep=0"
+</code>
+If the **name** is default, then it overwrites the value set by **async_workers**.
+See also **event_route[core:pre-routing]** and **sworker** module.
 ==== auto_aliases ====

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