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Related to issue #75: Improve documentation of cpuid_get_total_cpus().

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Veselin Georgiev 2016-10-18 01:54:27 +03:00
parent 4c776cb465
commit 6907241564
1 changed files with 14 additions and 2 deletions
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16
libcpuid/libcpuid.h
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@ -261,11 +261,17 @@ struct cpu_id_t {
/**
* The total number of logical processors.
* The same value is availabe through \ref cpuid_get_total_cpus.
*
* This is num_logical_cpus * {total physical processors in the system}
* (but only on a real system, under a VM this number may be lower).
*
* If you're writing a multithreaded program and you want to run it on
* all CPUs, this is the number of threads you need.
*
* @note in a VM, this will exactly match the number of CPUs set in
* the VM's configuration.
*
*/
int32_t total_logical_cpus;
@ -556,8 +562,14 @@ struct cpu_mark_t {
};
/**
* @brief Returns the total number of CPUs even if CPUID is not present
* @retval Number of CPUs available
* @brief Returns the total number of logical CPU threads (even if CPUID is not present).
*
* Under VM, this number (and total_logical_cpus, since they are fetched with the same code)
* may be nonsensical, i.e. might not equal NumPhysicalCPUs*NumCoresPerCPU*HyperThreading.
* This is because no matter how many logical threads the host machine has, you may limit them
* in the VM to any number you like. **This** is the number returned by cpuid_get_total_cpus().
*
* @returns Number of logical CPU threads available. Equals the \ref cpu_id_t::total_logical_cpus.
*/
int cpuid_get_total_cpus(void);