71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
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/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sync
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// #include <semaphore.h>
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import "C"
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import (
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_ "unsafe"
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c "github.com/goplus/llgo/runtime/internal/clite"
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)
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// Sem represents a semaphore.
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type Sem C.sem_t
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// initializes the unnamed semaphore at the address
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// pointed to by sem. The value argument specifies the initial
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// value for the semaphore.
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//
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// The pshared argument indicates whether this semaphore is to be
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// shared between the threads of a process, or between processes.
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//
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// If pshared has the value 0, then the semaphore is shared between
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// the threads of a process, and should be located at some address
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// that is visible to all threads (e.g., a global variable, or a
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// variable allocated dynamically on the heap).
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//
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// If pshared is nonzero, then the semaphore is shared between
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// processes, and should be located in a region of shared memory
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// (see shm_open(3), mmap(2), and shmget(2)). (Since a child
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// created by fork(2) inherits its parent's memory mappings, it can
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// also access the semaphore.) Any process that can access the
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// shared memory region can operate on the semaphore using
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// sem_post(3), sem_wait(3), and so on.
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//
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// Initializing a semaphore that has already been initialized
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// results in undefined behavior.
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//
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// llgo:link (*Sem).Init C.sem_init
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func (*Sem) Init(pshared c.Int, value c.Uint) c.Int { return 0 }
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// llgo:link (*Sem).Destroy C.sem_destroy
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func (*Sem) Destroy() c.Int { return 0 }
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// llgo:link (*Sem).Post C.sem_post
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func (*Sem) Post() c.Int { return 0 }
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// llgo:link (*Sem).Wait C.sem_wait
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func (*Sem) Wait() c.Int { return 0 }
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// llgo:link (*Sem).TryWait C.sem_trywait
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func (*Sem) TryWait() c.Int { return 0 }
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// llgo:link (*Sem).GetValue C.sem_getvalue
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func (*Sem) GetValue(sval *c.Int) c.Int { return 0 }
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