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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <synch/synch.h> |
- | |
30 | #include <synch/semaphore.h> |
29 | #include <synch/semaphore.h> |
31 | #include <synch/waitq.h> |
30 | #include <synch/waitq.h> |
32 | #include <synch/spinlock.h> |
31 | #include <synch/spinlock.h> |
- | 32 | #include <synch/synch.h> |
|
33 | #include <arch/asm.h> |
33 | #include <arch/asm.h> |
34 | #include <arch.h> |
34 | #include <arch.h> |
35 | 35 | ||
- | 36 | /** Initialize semaphore |
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- | 37 | * |
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- | 38 | * Initialize semaphore. |
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- | 39 | * |
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- | 40 | * @param s Semaphore. |
|
- | 41 | * @param val Maximal number of threads allowed to enter critical section. |
|
- | 42 | */ |
|
36 | void semaphore_initialize(semaphore_t *s, int val) |
43 | void semaphore_initialize(semaphore_t *s, int val) |
37 | { |
44 | { |
38 | pri_t pri; |
45 | pri_t pri; |
39 | 46 | ||
40 | waitq_initialize(&s->wq); |
47 | waitq_initialize(&s->wq); |
Line 46... | Line 53... | ||
46 | spinlock_unlock(&s->wq.lock); |
53 | spinlock_unlock(&s->wq.lock); |
47 | 54 | ||
48 | cpu_priority_restore(pri); |
55 | cpu_priority_restore(pri); |
49 | } |
56 | } |
50 | 57 | ||
- | 58 | /** Semaphore down |
|
- | 59 | * |
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- | 60 | * Semaphore down. |
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- | 61 | * Conditional mode and mode with timeout can be requested. |
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- | 62 | * |
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- | 63 | * @param s Semaphore. |
|
- | 64 | * @param usec Timeout in microseconds. |
|
- | 65 | * @param trydown Switches between blocking and non-blocking mode. |
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- | 66 | * |
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- | 67 | * For exact description of possible combinations of |
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- | 68 | * 'usec' and 'trydown', see comment for waitq_sleep_timeout(). |
|
- | 69 | * |
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- | 70 | * @return See comment for waitq_sleep_timeout(). |
|
- | 71 | */ |
|
51 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
72 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
52 | { |
73 | { |
53 | return waitq_sleep_timeout(&s->wq, usec, trydown); |
74 | return waitq_sleep_timeout(&s->wq, usec, trydown); |
54 | } |
75 | } |
55 | 76 | ||
- | 77 | /** Semaphore up |
|
- | 78 | * |
|
- | 79 | * Semaphore up. |
|
- | 80 | * |
|
- | 81 | * @param s Semaphore. |
|
- | 82 | */ |
|
56 | void semaphore_up(semaphore_t *s) |
83 | void semaphore_up(semaphore_t *s) |
57 | { |
84 | { |
58 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
85 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
59 | } |
86 | } |