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Showing content from http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/Semaphore.html below:

Class: Concurrent::Semaphore — Concurrent Ruby

Inherits:

SemaphoreImplementation

• Object
• Concurrent::Semaphore

show all

Defined in:

lib/concurrent-ruby/concurrent/atomic/semaphore.rb

A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each #acquire blocks if necessary until a permit is available, and then takes it. Each #release adds a permit, potentially releasing a blocking acquirer. However, no actual permit objects are used; the Semaphore just keeps a count of the number available and acts accordingly. Alternatively, permits may be acquired within a block, and automatically released after the block finishes executing.

• #acquire(permits = 1) ⇒ nil, BasicObject

  Acquires the given number of permits from this semaphore, blocking until all are available.

• #available_permits ⇒ Integer

  Returns the current number of permits available in this semaphore.

• #drain_permits ⇒ Integer

  Acquires and returns all permits that are immediately available.

• #initialize(count) ⇒ undocumented constructor

  Create a new Semaphore with the initial count.

• #release(permits = 1) ⇒ nil

  Releases the given number of permits, returning them to the semaphore.

• #try_acquire(permits = 1, timeout = nil) ⇒ true, false, nil, BasicObject

  Acquires the given number of permits from this semaphore, only if all are available at the time of invocation or within timeout interval.

Create a new Semaphore with the initial count.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

Acquires the given number of permits from this semaphore, blocking until all are available. If a block is given, yields to it and releases the permits afterwards.

is given, its return value is returned.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

Returns the current number of permits available in this semaphore.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

Acquires and returns all permits that are immediately available.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

Releases the given number of permits, returning them to the semaphore.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

Acquires the given number of permits from this semaphore, only if all are available at the time of invocation or within timeout interval. If a block is given, yields to it if the permits were successfully acquired, and releases them afterward, returning the block's return value.

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# File 'lib/concurrent-ruby/concurrent/atomic/semaphore.rb', line 161

class Semaphore < SemaphoreImplementation
end

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