mirror of
https://github.com/status-im/nim-taskpools.git
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17e8479a74
* barriers: add abi fields ...allowing compile-time sizeof discovery * `bycopy` * barrier init actually takes a barrier attr * use byref for barrier * note mapping safety issues * add PR link
61 lines
2.8 KiB
Nim
61 lines
2.8 KiB
Nim
# Weave
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# Copyright (c) 2019 Mamy André-Ratsimbazafy
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# Abstractions over POSIX barriers (non-)implementations
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when not compileOption("threads"):
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{.error: "This requires --threads:on compilation flag".}
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# Types
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# -------------------------------------------------------
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when defined(osx):
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import ./barriers_macos
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export PthreadBarrierAttr, PthreadBarrier, Errno, PTHREAD_BARRIER_SERIAL_THREAD
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else:
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type
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PthreadBarrierAttr* {.importc: "pthread_barrierattr_t", header: "<sys/types.h>", byref.} = object
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when (defined(linux) and not defined(android)) and defined(amd64):
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abi: array[4 div sizeof(cint), cint] # https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/nptl/bits/pthreadtypes-arch.h;h=dd06d6753ebc80d94ede6c3c18227a3ad3104570;hb=HEAD#l45
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PthreadBarrier* {.importc: "pthread_barrier_t", header: "<sys/types.h>", byref.} = object
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when (defined(linux) and not defined(android)) and defined(amd64):
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abi: array[32 div sizeof(clong), clong] # https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/nptl/bits/pthreadtypes-arch.h;h=dd06d6753ebc80d94ede6c3c18227a3ad3104570;hb=HEAD#l28
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Errno* = cint
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var PTHREAD_BARRIER_SERIAL_THREAD* {.importc, header:"<pthread.h>".}: Errno
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# Pthread
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# -------------------------------------------------------
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when defined(osx):
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export pthread_barrier_init, pthread_barrier_wait, pthread_barrier_destroy
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else:
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# TODO careful, this function mutates `barrier` without it being `var` which
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# is allowed as a consequence of `byref` - it is also different from the
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# one in barriers_macos
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# see https://github.com/status-im/nim-taskpools/pull/20#discussion_r923843093
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proc pthread_barrier_init*(
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barrier: PthreadBarrier,
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attr: ptr PthreadBarrierAttr,
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count: cuint
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): Errno {.header: "<pthread.h>".}
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## Initialize `barrier` with the attributes `attr`.
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## The barrier is opened when `count` waiters arrived.
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# TODO the macos signature is var instead of sink
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proc pthread_barrier_destroy*(
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barrier: sink PthreadBarrier): Errno {.header: "<pthread.h>".}
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## Destroy a previously dynamically initialized `barrier`.
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proc pthread_barrier_wait*(
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barrier: var PthreadBarrier
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): Errno {.header: "<pthread.h>".}
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## Wait on `barrier`
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## Returns PTHREAD_BARRIER_SERIAL_THREAD for a single arbitrary thread
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## Returns 0 for the other
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## Returns Errno if there is an error
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