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Diffstat (limited to 'include/asterisk/threadstorage.h')
| -rw-r--r-- | include/asterisk/threadstorage.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/asterisk/threadstorage.h b/include/asterisk/threadstorage.h index d13b616f0..4886d3520 100644 --- a/include/asterisk/threadstorage.h +++ b/include/asterisk/threadstorage.h @@ -21,7 +21,20 @@ * \author Russell Bryant <russell@digium.com> * * \brief Definitions to aid in the use of thread local storage -*/ + * + * The POSIX threads (pthreads) API provides the ability to define thread + * specific data. The functions and structures defined here are intended + * to centralize the code that is commonly used when using thread local + * storage. + * + * The motivation for using this code in Asterisk is for situations where + * storing data on a thread-specific basis can provide some amount of + * performance benefit. For example, there are some call types in Asterisk + * where ast_frame structures must be allocated very rapidly (easily 50, 100, + * 200 times a second). Instead of doing the equivalent of that many calls + * to malloc() and free() per second, thread local storage is used to keep a + * list of unused frame structures so that they can be continuously reused. + */ #ifndef ASTERISK_THREADSTORAGE_H #define ASTERISK_THREADSTORAGE_H |