17.3.5 SRFI-18

SRFI-18 function: mutex-state mutex

Returns information about the state of the mutex. The possible results are:

• thread T: the mutex is in the locked/owned state and thread T is the owner of the mutex
• symbol not-owned: the mutex is in the locked/not-owned state
• symbol abandoned: the mutex is in the unlocked/abandoned state
• symbol not-abandoned: the mutex is in the unlocked/not-abandoned state

Examples:

(mutex-state (make-mutex))  
   ⇒ not-abandoned

(define (thread-alive? thread)
   (let ((mutex (make-mutex)))
      (mutex-lock! mutex #f thread)
      (let ((state (mutex-state mutex)))
         (mutex-unlock! mutex) ; avoid space leak
         (eq? state thread))))

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