From 314bca3dc19a864c76153bfcd5a58be8c40000f9 Mon Sep 17 00:00:00 2001 From: Kimplul Date: Fri, 30 Aug 2024 19:20:21 +0300 Subject: improvements to shared memory handling + Now each shared region is reference counter (technically each region is refernce counted, private regions just have a count of 1). Also, syscalls that touch the TLB get flushed, but should probably look into where else this flushing might be needed. --- tests/shmem/init.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 tests/shmem/init.c (limited to 'tests/shmem/init.c') diff --git a/tests/shmem/init.c b/tests/shmem/init.c new file mode 100644 index 0000000..13e1667 --- /dev/null +++ b/tests/shmem/init.c @@ -0,0 +1,36 @@ +#include + +START(pid, tid, d0, d1, d2, d3) +{ + UNUSED(pid); + UNUSED(tid); + UNUSED(d0); + UNUSED(d1); + UNUSED(d2); + UNUSED(d3); + + printf("allocating shared memory\n"); + volatile char *shmem = sys_req_sharedmem(1, VM_R | VM_W); + check(shmem, "no shared memory?\n"); + + *shmem = 'p'; + + printf("sharing memory to ourselves\n"); + volatile char *refmem = sys_ref_sharedmem(1, (uintptr_t)shmem, VM_R | VM_W); + check(refmem[0] == 'p', "wrong mapping?\n"); + + printf("freeing shared memory (should fail)\n"); + enum sys_status r = sys_free_mem((uintptr_t)shmem); + check(r != OK, "illegal freeing succeeded?\n"); + + printf("freeing referenced memory\n"); + r = sys_free_mem((uintptr_t)refmem); + check(r == OK, "legal ref freeing failed?\n"); + check(shmem[0] == 'p', "freeing ref freed owned memory?\n"); + + printf("freeing recently nonshared memory\n"); + r = sys_free_mem((uintptr_t)shmem); + check(r == OK, "legal freeing failed?\n"); + + ok(); +} -- cgit v1.3