Module Semaphore.Binary

Contents

Instructions: Use this module in your project

In the IDE (CLion, Visual Studio Code, Xcode, etc.) you use for your DkSDK project:

  1. Add the following to your project's dependencies/CMakeLists.txt:

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    DkSDKProject_DeclareAvailable(ocaml
        CONSTRAINT "= 4.14.0"
        FINDLIBS str unix runtime_events threads dynlink)
    DkSDKProject_MakeAvailable(ocaml)
  2. Add the Findlib::ocaml library to any desired targets in src/*/CMakeLists.txt:

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    target_link_libraries(YourPackage_YourLibraryName
         # ... existing libraries, if any ...
         Findlib::ocaml)
  3. Click your IDE's Build button

Not using DkSDK?

FIRST, do one or all of the following:

  1. Run:

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    opam install ocaml.4.14.0
  2. Edit your dune-project and add:

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    (package
      (name YourExistingPackage)
      (depends
      ; ... existing dependenices ...
      (ocaml (>= 4.14.0))))

    Then run:

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    dune build *.opam # if this fails, run: dune build
  3. Edit your <package>.opam file and add:

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    depends: [
      # ... existing dependencies ...
      "ocaml" {>= "4.14.0"}
    ]

    Then run:

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    opam install . --deps-only

FINALLY, add the unix threads library to any desired (library)and/or (executable) targets in your **/dune files:

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(library
  (name YourLibrary)
  ; ... existing library options ...
  (libraries
    ; ... existing libraries ...
    unix threads))

(executable
  (name YourExecutable)
  ; ... existing executable options ...
  (libraries
    ; ... existing libraries ...
    unix threads))
type t

The type of binary semaphores.

valmake : ``bool-> t

make b returns a new binary semaphore. If b is true, the initial value of the semaphore is 1, meaning "available". If b is false, the initial value of the semaphore is 0, meaning "unavailable".

valrelease :t -> unit

release s sets the value of semaphore s to 1, putting it in the "available" state. If other threads are waiting on s, one of them is restarted.

valacquire :t -> unit

acquire s blocks the calling thread until the semaphore s has value 1 (is available), then atomically sets it to 0 and returns.

valtry_acquire :t -> bool

try_acquire s immediately returns false if the semaphore s has value 0. If s has value 1, its value is atomically set to 0 and try_acquire s returns true.

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