SMP Design: Difference between revisions
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The SMP / multithread design has several levels in the ALSA project codebase. The kernel drivers are fully SMP / thread safe. The alsa-lib was designed to allow grouping of commands for returned handle to optimize pthread locking. The snd_*_open() calls are thread safe. The use of returned handles must be serialized in the application using own locking scheme. Standalone (not handle related) functions in alsa-lib should be fully thread safe. | The SMP / multithread design has several levels in the ALSA project codebase. The kernel drivers are fully SMP / thread safe. The alsa-lib was designed to allow grouping of commands for returned handle to optimize pthread locking. The snd_*_open() calls are thread safe. The use of returned handles must be serialized in the application using own locking scheme. Standalone (not handle related) functions in alsa-lib should be fully thread safe. | ||
There are a few global variables that are used in alsa-lib, such as the global error handler pointer and the global root config pointer. | |||
Accessing / modifying these would be thread-unsafe. | |||
If you find a bug in kernel or alsa-lib which breaks these rules, please, let us know. | If you find a bug in kernel or alsa-lib which breaks these rules, please, let us know. | ||
Latest revision as of 11:14, 31 January 2013
The SMP / multithread design has several levels in the ALSA project codebase. The kernel drivers are fully SMP / thread safe. The alsa-lib was designed to allow grouping of commands for returned handle to optimize pthread locking. The snd_*_open() calls are thread safe. The use of returned handles must be serialized in the application using own locking scheme. Standalone (not handle related) functions in alsa-lib should be fully thread safe.
There are a few global variables that are used in alsa-lib, such as the global error handler pointer and the global root config pointer. Accessing / modifying these would be thread-unsafe.
If you find a bug in kernel or alsa-lib which breaks these rules, please, let us know.