Subject: Assignment mp2

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Turn in directories on jmw are now available

In the version that you submit MAKE SURE that sylvester() and
tweety() generate NO OUTPUT WHATEVER!!! Its fine to leave
diagnostic code in as long as it is disabled by default
using the conditional compilation mechanism.

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I HIGHLY discourage the use of pthread_cond_signal() because its
semantics seem to vary depending upon whose man page you read:

I quote from Suns:

     The pthread_cond_signal() call unblocks at least one of  the
     threads that are blocked on the specified condition variable
     cond (if any threads are blocked on cond).

     The  pthread_cond_broadcast()  call  unblocks  all   threads
     currently blocked on the specified condition variable cond.

The Linux man page says it unblocks "one" but which one is
not known.

Using something that unblocks "at least one" maybe two, maybe
all in some unknown order seems dangerous to me.

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For final checking I find generating output of the following form
useful: (alloc1 means alloc before blocking alloc2 means alloc after
wakeup) --- but, needless to say,  DON"T turn in something that
generates this by default!!

Alloc1 tid  0 with  1
block1 tid  1 with  1
block1 tid  2 with  1
block1 tid  3 with  1
block1 tid  4 with  1
block1 tid  5 with  1
block1 tid  6 with  1
block1 tid  7 with  1
block1 tid  8 with  1
block1 tid  9 with  1
block1 tid 10 with  1
block1 tid 11 with  1
block1 tid 12 with  1
block1 tid 13 with  1
block1 tid 14 with  1
block1 tid 15 with  1
Releas tid  0 with  0
Alloc2 tid  1 with  1
block1 tid  0 with  1
Releas tid  1 with  0
Alloc2 tid  2 with  1
Alloc2 tid  3 with  2
Alloc2 tid  4 with  3
Alloc2 tid  5 with  4
Alloc2 tid  6 with  5
Alloc2 tid  7 with  6
Alloc2 tid  8 with  7
Alloc2 tid  9 with  8
Alloc2 tid 10 with  9
Alloc2 tid 11 with 10
Alloc2 tid 12 with 11
Alloc2 tid 13 with 12
Alloc2 tid 14 with 13
Alloc2 tid 15 with 14
block1 tid  1 with 14
Releas tid  2 with 13
Releas tid  4 with 12
Releas tid  3 with 11
Releas tid  7 with 10
Releas tid  6 with  9
Releas tid  5 with  8
Releas tid 10 with  7
Releas tid  9 with  6
Releas tid  8 with  5