XrdSysSemWait Class Reference

#include <XrdSysSemWait.hh>

Collaboration diagram for XrdSysSemWait:

Public Member Functions
	XrdSysSemWait (int semval=1, const char *cid=0)
	~XrdSysSemWait ()
int	CondWait ()
void	Post ()
void	Wait ()
int	Wait (int secs)

Detailed Description

Definition at line 34 of file XrdSysSemWait.hh.

Constructor & Destructor Documentation

XrdSysSemWait()

XrdSysSemWait::XrdSysSemWait ( int  semval = 1, const char *  cid = 0  )

inline

Definition at line 109 of file XrdSysSemWait.hh.

                                                 : semVar(0, cid) {
      semVal = semval; semWait = 0;
   }

~XrdSysSemWait()

XrdSysSemWait::~XrdSysSemWait ( )

inline

Definition at line 113 of file XrdSysSemWait.hh.

{}

Member Function Documentation

CondWait()

int XrdSysSemWait::CondWait ( )

inline

Definition at line 37 of file XrdSysSemWait.hh.

                   {
 
      int rc = 0;
      // Wait until the sempahore value is positive. This will not be starvation
      // free is the OS implements an unfair mutex;
      // Returns 0 if signalled, non-0 if would block
      //
 
      semVar.Lock();
      if (semVal > 0) semVal--;
      else {
         rc = 1;
      }
 
      semVar.UnLock();
 
      return rc;
 
   };

References XrdSysCondVar::Lock(), and XrdSysCondVar::UnLock().

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Post()

void XrdSysSemWait::Post ( )

inline

Definition at line 57 of file XrdSysSemWait.hh.

               {
      // Add one to the semaphore counter. If we the value is > 0 and there is a
      // thread waiting for the sempagore, signal it to get the semaphore.
      //
      semVar.Lock();
 
      if (semWait > 0) {
         semVar.Signal();
         semWait--;
      }
      else
         semVal++;
      
      semVar.UnLock();
   };

References XrdSysCondVar::Lock(), XrdSysCondVar::Signal(), and XrdSysCondVar::UnLock().

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Wait() [1/2]

void XrdSysSemWait::Wait ( )

inline

Definition at line 73 of file XrdSysSemWait.hh.

                 {
      // Wait until the sempahore value is positive. This will not be starvation
      // free is the OS implements an unfair mutex;
      //
 
      semVar.Lock();
      if (semVal > 0) semVal--;
      else {
         semWait++;
         semVar.Wait();
      }
 
      semVar.UnLock();
 
   };

References XrdSysCondVar::Lock(), XrdSysCondVar::UnLock(), and XrdSysCondVar::Wait().

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Wait() [2/2]

int XrdSysSemWait::Wait ( int  secs )

inline

Definition at line 89 of file XrdSysSemWait.hh.

                       {
      int rc = 0;
      // Wait until the sempahore value is positive. This will not be starvation
      // free is the OS implements an unfair mutex;
      // Returns 0 if signalled, non-0 if timeout
      //
 
      semVar.Lock();
      if (semVal > 0) semVal--;
      else {
         semWait++;
         rc = semVar.Wait(secs);
         if (rc) semWait--;
      }
 
      semVar.UnLock();
 
      return rc;
   };

References XrdSysCondVar::Lock(), XrdSysCondVar::UnLock(), and XrdSysCondVar::Wait().

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The documentation for this class was generated from the following file:

• XrdSysSemWait.hh