/*
 * Copyright (c) 2014      Mellanox Technologies, Inc.
 *                         All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */

#ifndef MCA_SSHMEM_SYSV_EXPORT_H
#define MCA_SSHMEM_SYSV_EXPORT_H

#include "oshmem_config.h"

#include "opal/util/sys_limits.h"

#include "oshmem/mca/sshmem/sshmem.h"

BEGIN_C_DECLS

/**
 * globally exported variable to hold the sysv component.
 */
typedef struct mca_sshmem_sysv_component_t {
    /* base component struct */
    mca_sshmem_base_component_t super;
    /* priority for sysv component */
    int priority;
    int use_hp;
} mca_sshmem_sysv_component_t;

OSHMEM_MODULE_DECLSPEC extern mca_sshmem_sysv_component_t
mca_sshmem_sysv_component;

typedef struct mca_sshmem_sysv_module_t {
    mca_sshmem_base_module_t super;
} mca_sshmem_sysv_module_t;
extern mca_sshmem_sysv_module_t mca_sshmem_sysv_module;

/*
 * Get current huge page size
 */
static size_t oshmem_gethugepagesize(void)
{
    static size_t huge_page_size = 0;
    char buf[256];
    int size_kb;
    FILE *f;

    /* Cache the huge page size value */
    if (huge_page_size == 0) {
        f = fopen("/proc/meminfo", "r");
        if (f != NULL) {
            while (fgets(buf, sizeof(buf), f)) {
                if (sscanf(buf, "Hugepagesize: %d kB", &size_kb) == 1) {
                    huge_page_size = size_kb * 1024L;
                    break;
                }
            }
            fclose(f);
        }

        if (huge_page_size == 0) {
            huge_page_size = 2 * 1024L *1024L;
        }
    }

    return huge_page_size;
}
END_C_DECLS

#endif /* MCA_SSHMEM_SYSV_EXPORT_H */