diff options
Diffstat (limited to 'sys/kern/sysv_shm.c')
| -rw-r--r-- | sys/kern/sysv_shm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c index fab53a8..0a9abda 100644 --- a/sys/kern/sysv_shm.c +++ b/sys/kern/sysv_shm.c @@ -43,6 +43,7 @@ #include <sys/shm.h> #include <sys/proc.h> #include <sys/malloc.h> +#include <sys/mutex.h> #include <sys/mman.h> #include <sys/stat.h> #include <sys/syscall.h> @@ -314,14 +315,17 @@ shmat(p, uap) } shm_handle = shmseg->shm_internal; + mtx_lock(&vm_mtx); vm_object_reference(shm_handle->shm_object); rv = vm_map_find(&p->p_vmspace->vm_map, shm_handle->shm_object, 0, &attach_va, size, (flags & MAP_FIXED)?0:1, prot, prot, 0); if (rv != KERN_SUCCESS) { + mtx_unlock(&vm_mtx); return ENOMEM; } vm_map_inherit(&p->p_vmspace->vm_map, attach_va, attach_va + size, VM_INHERIT_SHARE); + mtx_unlock(&vm_mtx); shmmap_s->va = attach_va; shmmap_s->shmid = uap->shmid; @@ -549,6 +553,7 @@ shmget_allocate_segment(p, uap, mode) * We make sure that we have allocated a pager before we need * to. */ + mtx_lock(&vm_mtx); if (shm_use_phys) { shm_handle->shm_object = vm_pager_allocate(OBJT_PHYS, 0, size, VM_PROT_DEFAULT, 0); @@ -558,6 +563,7 @@ shmget_allocate_segment(p, uap, mode) } vm_object_clear_flag(shm_handle->shm_object, OBJ_ONEMAPPING); vm_object_set_flag(shm_handle->shm_object, OBJ_NOSPLIT); + mtx_unlock(&vm_mtx); shmseg->shm_internal = shm_handle; shmseg->shm_perm.cuid = shmseg->shm_perm.uid = cred->cr_uid; |
