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misc: add function to get CPU affinity mask size

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Implement it on Linux, FreeBSD, and Windows for now, and return
UV_ENOTSUP on other platforms.

Inspired-by: Kiran Pamnany <kiran.pamnany@intel.com>
Fixes: https://github.com/libuv/libuv/issues/1389
PR-URL: https://github.com/libuv/libuv/pull/1527
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
This commit is contained in:
Brad King 2017-09-06 15:01:17 -04:00 committed by Santiago Gimeno
parent f94282c7ab
commit 6521405c07
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GPG Key ID: F28C3C8DA33C03BE
4 changed files with 23 additions and 1 deletions
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7
docs/src/misc.rst
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@ -246,6 +246,13 @@ API
Frees the `cpu_infos` array previously allocated with :c:func:`uv_cpu_info`.
.. c:function:: int uv_cpumask_size(void)
Returns the maximum size of the mask used for process/thread affinities,
or ``UV_ENOTSUP`` if affinities are not supported on the current platform.
.. versionadded:: 2.0.0
.. c:function:: int uv_interface_addresses(uv_interface_address_t** addresses, int* count)
Gets address information about the network interfaces on the system. An

1
include/uv.h
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@ -1142,6 +1142,7 @@ UV_EXTERN uv_pid_t uv_os_getppid(void);
UV_EXTERN int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count);
UV_EXTERN void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count);
UV_EXTERN int uv_cpumask_size(void);
UV_EXTERN int uv_interface_addresses(uv_interface_address_t** addresses,
int* count);

12
src/unix/core.c
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@ -40,6 +40,7 @@
#include <sys/uio.h> /* writev */
#include <sys/resource.h> /* getrusage */
#include <pwd.h>
#include <sched.h>
#ifdef __sun
# include <netdb.h> /* MAXHOSTNAMELEN on Solaris */
@ -63,6 +64,8 @@
# include <sys/sysctl.h>
# include <sys/filio.h>
# include <sys/wait.h>
# include <sys/param.h>
# include <sys/cpuset.h>
# define UV__O_CLOEXEC O_CLOEXEC
# if defined(__FreeBSD__)
# define uv__accept4 accept4
@ -1336,7 +1339,6 @@ int uv_os_gethostname(char* buffer, size_t* size) {
return 0;
}
uv_pid_t uv_os_getpid(void) {
return getpid();
}
@ -1345,3 +1347,11 @@ uv_pid_t uv_os_getpid(void) {
uv_pid_t uv_os_getppid(void) {
return getppid();
}
int uv_cpumask_size(void) {
#if defined(__linux__) || defined(__FreeBSD__)
return CPU_SETSIZE;
#else
return UV_ENOTSUP;
#endif
}

4
src/win/core.c
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@ -427,3 +427,7 @@ int uv__socket_sockopt(uv_handle_t* handle, int optname, int* value) {
return 0;
}
int uv_cpumask_size(void) {
return (int)(sizeof(DWORD_PTR) * 8);
}