Function cacheline_aligned_alloc

src/utils/alloc.cpp:31–51

extern */

namespace dsn {

/* extern */ void *cacheline_aligned_alloc(size_t size)
{
    if (dsn_unlikely(size == 0)) {
        return nullptr;
    }

    void *buffer = nullptr;
    // CACHELINE_SIZE must be a power of 2 and a multiple of sizeof(void *), which have been
    // checked statically at compile time when CACHELINE_SIZE is defined as macro.
    int err = posix_memalign(&buffer, CACHELINE_SIZE, size);

    // Generally there are 2 possible errors for posix_memalign as below:
    // [EINVAL]
    //     The value of the alignment parameter is not a power of two multiple of sizeof(void *).
    // [ENOMEM]
    //     There is insufficient memory available with the requested alignment.
    // Thus making an assertion here is enough.
    CHECK_EQ_MSG(err, 0, "error calling posix_memalign: {}", utils::safe_strerror(err));

    return buffer;
}

/* extern */ void cacheline_aligned_free(void *mem_block) { free(mem_block); }