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• Robert Mullins July 7, 2009 7:21 AM PDT    __tm_retry (ICC Prototype STM support) Is there a public document that describes the STM API in detail? is "__tm_retry" part of the API? If so, what is its behaviour precisely? Many thanks for any help. Ravi Narayanaswamy (Intel) July 8, 2009 5:00 PM PDT Rate   #1 Re: __tm_retry (ICC Prototype STM support) Quoting - Robert Mullins Is there a public document that describes the STM API in detail? is "__tm_retry" part of the API? If so, what is its behaviour precisely? Many thanks for any help. __tm_retry is provided as an experimental language extension support in the compiler.  __tm_retry aborts the current transaction including all the outer transaction enclosing this transaction and retries the transaction starting from the outermost transaction. Robert Mullins July 9, 2009 2:28 AM PDT Rate   #2 Reply To #1 Re: __tm_retry (ICC Prototype STM support) Quoting - Ravi Narayanaswamy (Intel) __tm_retry is provided as an experimental language extension support in the compiler.  __tm_retry aborts the current transaction including all the outer transaction enclosing this transaction and retries the transaction starting from the outermost transaction. Many thanks for your reply Ravi.  I assume from the behaviour of the code below that __tm_retry simply spins rather than waiting for a change in the object state? Is there a simple way around this? __attribute__((tm_callable)) void Queue::enq (int v) { __tm_atomic { // queue is full if (count==MAX_LEN) __tm_retry; buf[tail]=v; if (++tail == MAX_LEN) tail=0; count++; } //  cout << "enq" << endl; } Ravi Narayanaswamy (Intel) July 9, 2009 10:28 AM PDT Rate   #3 Reply To #2 Re: __tm_retry (ICC Prototype STM support) Quoting - Robert Mullins Many thanks for your reply Ravi.  I assume from the behaviour of the code below that __tm_retry simply spins rather than waiting for a change in the object state? Is there a simple way around this? __attribute__((tm_callable)) void Queue::enq (int v) { __tm_atomic { // queue is full if (count==MAX_LEN) __tm_retry; buf[tail]=v; if (++tail == MAX_LEN) tail=0; count++; } //  cout << "enq" << endl; } __tm_retry was provided as an experimental hoping to get user feedback on the use case for this language extension.  So not much time was spend on an optimal implementation.

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