semaphore_signal_trap

Increment a Mach semaphore, waking at most one waiter.

Prototype

kern_return_t semaphore_signal_trap(/* 1 args */);

Returns: kern_return_t

Version history

XNU tag	macOS	#
xnu-123.5	macOS 10.0 Cheetah	-32
xnu-201	macOS 10.1 Puma	-32
xnu-344	macOS 10.2 Jaguar	-32
xnu-517	macOS 10.3 Panther	-32
xnu-792	macOS 10.4 Tiger	-33
xnu-1228	macOS 10.5 Leopard	-33
xnu-1456.1.26	macOS 10.6 Snow Leopard	-33
xnu-1699.24.8	macOS 10.7 Lion	-33
xnu-2050.18.24	macOS 10.8 Mountain Lion	-33
xnu-2422.115.4	macOS 10.9 Mavericks	-33
xnu-2782.40.9	macOS 10.10 Yosemite	-33
xnu-3247.1.106	macOS 10.11 El Capitan	-33
xnu-3789.1.32	macOS 10.12 Sierra	-33
xnu-4570.1.46	macOS 10.13 High Sierra	-33
xnu-4903.221.2	macOS 10.14 Mojave	-33
xnu-6153.11.26	macOS 10.15 Catalina	-33
xnu-7195.50.7.100.1	macOS 11.0 Big Sur	-33
xnu-8019.41.5	macOS 12.0 Monterey	-33
xnu-8792.41.9	macOS 13.0 Ventura	-33
xnu-10002.1.13	macOS 14.0 Sonoma	-33
xnu-11215.1.10	macOS 15.0 Sequoia	-33
xnu-11417.101.15	macOS 15.4 Sequoia	-33
xnu-12377.1.9	macOS 26.0 Tahoe	-33
xnu-10002.41.9	—	-33
xnu-10002.61.3	—	-33
xnu-10002.81.5	—	-33
xnu-10063.101.15	—	-33
xnu-10063.121.3	—	-33
xnu-10063.141.1	—	-33
xnu-11215.41.3	—	-33
xnu-11215.61.5	—	-33
xnu-11215.81.4	—	-33
xnu-11417.121.6	—	-33
xnu-11417.140.69	—	-33
xnu-1228.0.2	—	-33
xnu-1228.12.14	—	-33
xnu-1228.15.4	—	-33
xnu-1228.3.13	—	-33
xnu-1228.5.18	—	-33
xnu-1228.5.20	—	-33
xnu-1228.7.58	—	-33
xnu-1228.9.59	—	-33
xnu-12377.101.15	—	-33
xnu-12377.41.6	—	-33
xnu-12377.61.12	—	-33
xnu-12377.81.4	—	-33
xnu-124.1	—	-32
xnu-124.13	—	-32
xnu-124.7	—	-32
xnu-1486.2.11	—	-33
xnu-1504.15.3	—	-33
xnu-1504.3.12	—	-33
xnu-1504.7.4	—	-33
xnu-1504.9.17	—	-33
xnu-1504.9.26	—	-33
xnu-1504.9.37	—	-33
xnu-1699.22.73	—	-33
xnu-1699.22.81	—	-33
xnu-1699.24.23	—	-33
xnu-1699.26.8	—	-33
xnu-1699.32.7	—	-33
xnu-201.14	—	-32
xnu-201.19	—	-32
xnu-201.19.3	—	-32
xnu-201.42.3	—	-32
xnu-201.5	—	-32
xnu-2050.22.13	—	-33
xnu-2050.24.15	—	-33
xnu-2050.48.11	—	-33
xnu-2050.7.9	—	-33
xnu-2050.9.2	—	-33
xnu-2422.1.72	—	-33
xnu-2422.100.13	—	-33
xnu-2422.110.17	—	-33
xnu-2422.90.20	—	-33
xnu-2782.1.97	—	-33
xnu-2782.10.72	—	-33
xnu-2782.20.48	—	-33
xnu-2782.30.5	—	-33
xnu-3247.10.11	—	-33
xnu-3248.20.55	—	-33
xnu-3248.30.4	—	-33
xnu-3248.40.184	—	-33
xnu-3248.50.21	—	-33
xnu-3248.60.10	—	-33
xnu-344.12.2	—	-32
xnu-344.2	—	-32
xnu-344.21.73	—	-32
xnu-344.21.74	—	-32
xnu-344.23	—	-32
xnu-344.26	—	-32
xnu-344.32	—	-32
xnu-344.34	—	-32
xnu-344.49	—	-32
xnu-3789.21.4	—	-33
xnu-3789.31.2	—	-33
xnu-3789.41.3	—	-33
xnu-3789.51.2	—	-33
xnu-3789.60.24	—	-33
xnu-3789.70.16	—	-33
xnu-4570.20.62	—	-33
xnu-4570.31.3	—	-33
xnu-4570.41.2	—	-33
xnu-4570.51.1	—	-33
xnu-4570.61.1	—	-33
xnu-4570.71.2	—	-33
xnu-4903.231.4	—	-33
xnu-4903.241.1	—	-33
xnu-4903.270.47	—	-33
xnu-517.11.1	—	-32
xnu-517.12.7	—	-32
xnu-517.3.15	—	-32
xnu-517.3.7	—	-32
xnu-517.7.21	—	-32
xnu-517.7.7	—	-32
xnu-517.9.4	—	-32
xnu-517.9.5	—	-32
xnu-6153.101.6	—	-33
xnu-6153.121.1	—	-33
xnu-6153.141.1	—	-33
xnu-6153.41.3	—	-33
xnu-6153.61.1	—	-33
xnu-6153.81.5	—	-33
xnu-7195.101.1	—	-33
xnu-7195.121.3	—	-33
xnu-7195.141.2	—	-33
xnu-7195.60.75	—	-33
xnu-7195.81.3	—	-33
xnu-792.1.5	—	-33
xnu-792.10.96	—	-33
xnu-792.12.6	—	-33
xnu-792.13.8	—	-33
xnu-792.17.14	—	-33
xnu-792.18.15	—	-33
xnu-792.2.4	—	-33
xnu-792.21.3	—	-33
xnu-792.22.5	—	-33
xnu-792.24.17	—	-33
xnu-792.25.20	—	-33
xnu-792.6.22	—	-33
xnu-792.6.56	—	-33
xnu-792.6.61	—	-33
xnu-792.6.70	—	-33
xnu-792.6.76	—	-33
xnu-8019.61.5	—	-33
xnu-8019.80.24	—	-33
xnu-8020.101.4	—	-33
xnu-8020.121.3	—	-33
xnu-8020.140.41	—	-33
xnu-8792.61.2	—	-33
xnu-8792.81.2	—	-33
xnu-8796.101.5	—	-33
xnu-8796.121.2	—	-33
xnu-8796.141.3	—	-33

Notes

semaphore_signal_trap increments the semaphore's count and, if any threads are blocked in semaphore_wait, wakes exactly one. Wakeup order follows the semaphore's policy (FIFO or fixed-priority) chosen at creation time via semaphore_create.

Related APIs

semaphore_wait_trapsemaphore_signal_all_trapsemaphore_signal_thread_trapsemaphore_create