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Qualcomm Interview Question for Software Engineer / Developers


More Questions from This Interview



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3
of 3 vote

Shared memory is without question the fastest IPC mechanism that Unix provides. By having processes map the same block of memory, information transfer is almost immediate

- ridercoder November 14, 2010 | Flag Reply
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0
of 0 vote

shared memory
Because we need not copy some data from one place to another.

- lyzoridc March 28, 2010 | Flag Reply
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0
of 0 votes

@lyzoridc: err..the interviewer actually meant which is the fastest IPC mechanism between Semaphores, Monitors, Message passing and Signals. He kinda gave a hint about pipes when i tried to answer the question. Shared memory is not an IPC mechanism.

- Bandicoot April 02, 2010 | Flag
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0
of 0 votes

Actually, shared memory can be used for IPC since it is by definition in an address space accessible by all processes. If two processes agree on the use of the shared memory (e.g. a mailbox), then communication is 'fast'.

- fileperson April 03, 2010 | Flag
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0
of 0 votes

@Bandicoot: Shared memory indeed is an IPC mechanism. Check out any website or book.

- anonymous July 22, 2012 | Flag
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0
of 0 vote

Shared memory part of the IPC story. You can protect a piece of shared memory using semaphores, mutexes, etc.

- Joe April 11, 2010 | Flag Reply
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0
of 0 votes

semaphores and mutex are synchronization mechanisms

- Anonymous October 30, 2010 | Flag


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