Memory access controller, multi-core processor system, memory access control method, and computer product

A multi-core processor system comprising a processor configured to:

• determine to which group, a first group of cores having made an exclusive access request to a shared memory or a second group of cores not having made the exclusive access request to the shared memory, each core among multiple cores belongs;
• detect, upon determining a core to belong to the first group, completion of exclusive access by the core;
• and
• send, upon detecting the completion of exclusive access, a notification of release from a standby state to a core among the first group of cores and standing by for the exclusive access.

A memory access control method executed by a computer capable of accessing a shared memory, the memory access control method comprising:

• classifying multiple cores into a first group of cores having made an exclusive access request to the shared memory and a second group of cores not having made an exclusive access request to the shared memory;
• detecting a core having completed the exclusive access among the first group of cores classified at the classifying;
• and
• sending to a core that is among the first group of cores and is standing by for the exclusive access and when a core having completed the exclusive access is detected at the detecting, a notification of release from a standby state.

A memory access control method executed by a core, the memory access control method comprising:

• determining to which group, a first group of cores having made an exclusive access request to the shared memory or a second group of cores not having made the exclusive access request to the shared memory, each core among multiple cores belongs;
• detecting completion of exclusive access by the core, when a core is determined at the determining to belong to the first group;
• and
• sending to a core that is among the first group of cores and is standing by for the exclusive access and when the completion of exclusive access is detected at the detecting, a notification of release from a standby state.

A program causing a computer capable of accessing shared memory and multiple cores to execute a memory access control process comprising:

• classifying multiple cores into a first group of cores having made an exclusive access request to the shared memory and a second group of cores not having made an exclusive access request to the shared memory;
• detecting a core having completed the exclusive access among the first group of cores classified at the classifying;
• and
• sending to a core that is among the first group of cores and is standing by for the exclusive access and when a core having completed the exclusive access is detected at the detecting, a notification of release from a standby state.

A program causing a core to execute a memory access control process comprising:

• determining to which group, a first group of cores having made an exclusive access request to the shared memory or a second group of cores not having made the exclusive access request to the shared memory, each core among multiple cores belongs;
• detecting completion of exclusive access by the core, when a core is determined at the determining to belong to the first group;
• and
• sending to a core that is among the first group of cores and is standing by for the exclusive access and when the completion of exclusive access is detected at the detecting, a notification of release from a standby state.