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5.3 Synchronization & Communication Function (Semaphore)
Specifications of the semaphore function of MR100 are listed in Table 5.5.
Table 5.5 Specifications of the Semaphore Function
No. Item Content
1 Semaphore ID 1-255
2 Maximum number of resources 1-65535
TA_FIFO: Tasks enqueued in order of FIFO
3 Semaphore attribute
TA_TPRI: Tasks enqueued in order of priority
Table 5.6 List of Semaphore Function Service Call
System State
No. Service Call Function
T N E D U L
1 sig_sem
[S][B]
O O O O
2 isig_sem
[S][B]
Releases semaphore resource
O O O O
3 wai_sem
[S][B]
Acquires semaphore resource O O O
4 pol_sem
[S][B]
O O O O
5 ipol_sem
Acquires semaphore resource(polling)
O O O O
6 twai_sem
[S]
Acquires semaphore resource(with timeout) O O O
7 ref_sem O O O O
8 iref_sem
References semaphore status
O O O O
Notes:
• [S]: Standard profile service calls
[B]: Basic profile service calls
• Each sign within " System State " is a following meaning.
♦ T: Can be called from task context
♦ N: Can be called from non-task context
♦ E: Can be called from dispatch-enabled state
♦ D: Can be called from dispatch-disabled state
♦ U: Can be called from CPU-unlocked state
♦ L: Can be called from CPU-locked state