The Create command is used to create a new Mutex.  This command returns an integer identifier that is used to represent the mutex.

The Create command does not accept any arguments.

Once created, the mutex can be locked and unlocked using the Lock and Unlock commands.

When a mutex is no longer needed, it should be destroyed using the Destroy command.  This will release all the resources used by the mutex.

For more information on using mutexes, see the Mutex help page.

p := proc( m )
   global count;
   print( count );
   count := count+1;
end proc;

$p≔\mathbf{proc}\left(m\right)\mathbf{global}\mathrm{count}\;\mathrm{print}\left(\mathrm{count}\right)\;\mathrm{count}≔\mathrm{count}\+1\mathbf{end\; proc}$

$\mathrm{count}≔1$

$\mathrm{count}≔1$

$\mathrm{Threads}\left[\mathrm{Wait}\right]\left(\mathrm{seq}\left(\mathrm{Threads}\left[\mathrm{Create}\right]\left(p\left(m\right)\right)\,i=1..10\right)\right)$

$1$

$2$

$3$

$4$

$5$

$6$

$6$

$8$

$8$

$10$

p := proc( m )
   global count;
   Threads[Mutex][Lock]( m );

   print( count );
   count := count+1;

   Threads[Mutex][Unlock]( m );
end proc;

$p≔\mathbf{proc}\left(m\right)\mathbf{global}\mathrm{count}\;\mathrm{Threads}\[\mathrm{Mutex}\]\[\mathrm{Lock}\]\left(m\right)\;\mathrm{print}\left(\mathrm{count}\right)\;\mathrm{count}≔\mathrm{count}\+1\;\mathrm{Threads}\[\mathrm{Mutex}\]\[\mathrm{Unlock}\]\left(m\right)\mathbf{end\; proc}$

$\mathrm{count}≔1$

$\mathrm{count}≔1$

$m≔\mathrm{Threads}\left[\mathrm{Mutex}\right]\left[\mathrm{Create}\right]\left(\right)$

$m≔1$

$\mathrm{Threads}\left[\mathrm{Wait}\right]\left(\mathrm{seq}\left(\mathrm{Threads}\left[\mathrm{Create}\right]\left(p\left(m\right)\right)\,i=1..10\right)\right)\:$

$1$

$2$

$3$

$4$

$5$

$6$

$7$

$8$

$9$

$10$

$\mathrm{Threads}\left[\mathrm{Mutex}\right]\left[\mathrm{Destroy}\right]\left(m\right)$