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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2000-02-18 14:11:46 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2000-02-18 14:11:46 +0000 |
| commit | edc1347ed1484a9abd3d46f9c3c4fe0c0543f940 (patch) | |
| tree | 3cd6e45d9ea7854d49d2cfbe7e8b684f02baf487 /doc/user/sem.t | |
| parent | changed version to 4.5.0-beta1b (diff) | |
| download | rtems-edc1347ed1484a9abd3d46f9c3c4fe0c0543f940.tar.bz2 | |
Patch from Eric Norum <eric@cls.usask.ca> to include some information
on simple binary semaphores.
Diffstat (limited to '')
| -rw-r--r-- | doc/user/sem.t | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/user/sem.t b/doc/user/sem.t index dfc9b819b2..e1d075085c 100644 --- a/doc/user/sem.t +++ b/doc/user/sem.t @@ -89,6 +89,8 @@ only be made available for acquisition by other tasks when the outermost @code{@value{DIRPREFIX}semaphore_obtain} is matched with a @code{@value{DIRPREFIX}semaphore_release}. +Simple binary semaphores do not allow nested access and so can be used for task synchronization. + @subsection Priority Inversion @@ -190,6 +192,9 @@ the set of valid semaphore attributes: @item @code{@value{RPREFIX}COUNTING_SEMAPHORE} - no restriction on values +@item @code{@value{RPREFIX}SIMPLE_BINARY_SEMAPHORE} - restrict values to +0 and 1 and do not allow nested access. + @item @code{@value{RPREFIX}NO_INHERIT_PRIORITY} - do not use priority inheritance (default) @@ -446,6 +451,9 @@ defined by RTEMS: @item @code{@value{RPREFIX}COUNTING_SEMAPHORE} - no restriction on values +@item @code{@value{RPREFIX}SIMPLE_BINARY_SEMAPHORE} - restrict values to +0 and 1 and do not allow nested access. + @item @code{@value{RPREFIX}NO_INHERIT_PRIORITY} - do not use priority inheritance (default) |