solution to 3.45

diff --git a/src/sicp/ex3_45.rkt b/src/sicp/ex3_45.rkt
new file mode 100644 (file)
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+++ b/src/sicp/ex3_45.rkt
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+#lang racket
+
+#|
+
+Deposits and Withdrawals are fine. But when it comes to exchange, we need a
+"mutually serialized" procedure with something like this:
+
+ (serializer-1 (serializer-2 exchange))
+
+Otherwise, we are creating a "time hole" when another execution process can
+get hold of one of the account and deposit/withdraw from it which will make
+the end result of exchange erroneous.
+
+|#
\ No newline at end of file