diff --git a/include/ck_pr.h b/include/ck_pr.h
index 3632f7b..00d95a0 100644
--- a/include/ck_pr.h
+++ b/include/ck_pr.h
@@ -97,6 +97,8 @@ CK_PR_FENCE_EMIT(store)
 CK_PR_FENCE_EMIT(memory)
 CK_PR_FENCE_EMIT(acquire)
 CK_PR_FENCE_EMIT(release)
+CK_PR_FENCE_EMIT(lock)
+CK_PR_FENCE_EMIT(unlock)
 #elif defined(CK_MD_PSO)
 /*
  * Anything can be re-ordered with respect to stores.
@@ -114,6 +116,8 @@ CK_PR_FENCE_EMIT(store)
 CK_PR_FENCE_EMIT(memory)
 CK_PR_FENCE_EMIT(acquire)
 CK_PR_FENCE_EMIT(release)
+CK_PR_FENCE_EMIT(lock)
+CK_PR_FENCE_EMIT(unlock)
 #elif defined(CK_MD_TSO)
 /*
  * Only loads are re-ordered and only with respect to
@@ -131,6 +135,8 @@ CK_PR_FENCE_NOOP(store)
 CK_PR_FENCE_NOOP(memory)
 CK_PR_FENCE_NOOP(acquire)
 CK_PR_FENCE_NOOP(release)
+CK_PR_FENCE_NOOP(lock)
+CK_PR_FENCE_NOOP(unlock)
 #else
 #error "No memory model has been defined."
 #endif /* CK_MD_TSO */
diff --git a/include/gcc/arm/ck_pr.h b/include/gcc/arm/ck_pr.h
index 35be59a..98cdb8d 100644
--- a/include/gcc/arm/ck_pr.h
+++ b/include/gcc/arm/ck_pr.h
@@ -94,6 +94,8 @@ CK_PR_FENCE(load_store, CK_DMB)
 CK_PR_FENCE(memory, CK_DMB)
 CK_PR_FENCE(acquire, CK_DMB)
 CK_PR_FENCE(release, CK_DMB)
+CK_PR_FENCE(lock, CK_DMB)
+CK_PR_FENCE(unlock, CK_DMB)
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/ck_pr.h b/include/gcc/ck_pr.h
index 53e75e1..cf6e699 100644
--- a/include/gcc/ck_pr.h
+++ b/include/gcc/ck_pr.h
@@ -142,6 +142,8 @@ CK_PR_FENCE(store_load)
 CK_PR_FENCE(memory)
 CK_PR_FENCE(acquire)
 CK_PR_FENCE(release)
+CK_PR_FENCE(lock)
+CK_PR_FENCE(unlock)
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/ppc/ck_pr.h b/include/gcc/ppc/ck_pr.h
index 305039a..ef9105c 100644
--- a/include/gcc/ppc/ck_pr.h
+++ b/include/gcc/ppc/ck_pr.h
@@ -79,6 +79,8 @@ CK_PR_FENCE(load_store, "lwsync")
 CK_PR_FENCE(memory, "sync")
 CK_PR_FENCE(acquire, "lwsync")
 CK_PR_FENCE(release, "lwsync")
+CK_PR_FENCE(lock, "isync")
+CK_PR_FENCE(unlock, "lwsync")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/ppc64/ck_pr.h b/include/gcc/ppc64/ck_pr.h
index 734f954..03a9cf1 100644
--- a/include/gcc/ppc64/ck_pr.h
+++ b/include/gcc/ppc64/ck_pr.h
@@ -82,6 +82,8 @@ CK_PR_FENCE(load_store, "lwsync")
 CK_PR_FENCE(memory, "sync")
 CK_PR_FENCE(acquire, "lwsync")
 CK_PR_FENCE(release, "lwsync")
+CK_PR_FENCE(lock, "isync")
+CK_PR_FENCE(unlock, "lwsync")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/sparcv9/ck_pr.h b/include/gcc/sparcv9/ck_pr.h
index 154d148..9e21748 100644
--- a/include/gcc/sparcv9/ck_pr.h
+++ b/include/gcc/sparcv9/ck_pr.h
@@ -79,6 +79,8 @@ CK_PR_FENCE(load_store, "membar #LoadStore")
 CK_PR_FENCE(memory, "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
 CK_PR_FENCE(acquire, "membar #LoadLoad | #LoadStore")
 CK_PR_FENCE(release, "membar #LoadStore | #StoreStore")
+CK_PR_FENCE(lock, "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
+CK_PR_FENCE(unlock, "membar #LoadStore | #StoreStore")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/x86/ck_pr.h b/include/gcc/x86/ck_pr.h
index 5eb9e89..c28381d 100644
--- a/include/gcc/x86/ck_pr.h
+++ b/include/gcc/x86/ck_pr.h
@@ -82,6 +82,8 @@ CK_PR_FENCE(store_load, "mfence")
 CK_PR_FENCE(memory, "mfence")
 CK_PR_FENCE(release, "mfence")
 CK_PR_FENCE(acquire, "mfence")
+CK_PR_FENCE(lock, "mfence")
+CK_PR_FENCE(unlock, "mfence")
 
 #undef CK_PR_FENCE
 
diff --git a/include/gcc/x86_64/ck_pr.h b/include/gcc/x86_64/ck_pr.h
index b56776f..9c8dd6d 100644
--- a/include/gcc/x86_64/ck_pr.h
+++ b/include/gcc/x86_64/ck_pr.h
@@ -88,6 +88,8 @@ CK_PR_FENCE(store_load, "mfence")
 CK_PR_FENCE(memory, "mfence")
 CK_PR_FENCE(release, "mfence")
 CK_PR_FENCE(acquire, "mfence")
+CK_PR_FENCE(lock, "mfence")
+CK_PR_FENCE(unlock, "mfence")
 
 #undef CK_PR_FENCE