diff --git a/libc/include/sched.h b/libc/include/sched.h
index e702470..ca72da7 100644
--- a/libc/include/sched.h
+++ b/libc/include/sched.h
@@ -73,6 +73,162 @@
 extern int clone(int (*fn)(void *), void *child_stack, int flags, void*  arg, ...);
 #endif
 
+/* Support for cpu thread affinity */
+#ifdef _GNU_SOURCE
+
+extern int sched_getcpu(void);
+
+
+/* Our implementation supports up to 32 independent CPUs, which is also
+ * the maximum supported by the kernel at the moment. GLibc uses 1024 by
+ * default.
+ *
+ * If you want to use more than that, you should use CPU_ALLOC() / CPU_FREE()
+ * and the CPU_XXX_S() macro variants.
+ */
+#define CPU_SETSIZE   32
+
+#define __CPU_BITTYPE    unsigned long int  /* mandated by the kernel  */
+#define __CPU_BITSHIFT   5                  /* should be log2(BITTYPE) */
+#define __CPU_BITS       (1 << __CPU_BITSHIFT)
+#define __CPU_ELT(x)     ((x) >> __CPU_BITSHIFT)
+#define __CPU_MASK(x)    ((__CPU_BITTYPE)1 << ((x) & (__CPU_BITS-1)))
+
+typedef struct {
+    __CPU_BITTYPE  __bits[ CPU_SETSIZE / __CPU_BITS ];
+} cpu_set_t;
+
+extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set);
+
+extern int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set);
+
+/* Provide optimized implementation for 32-bit cpu_set_t */
+#if CPU_SETSIZE == __CPU_BITS
+
+#  define CPU_ZERO(set_)   \
+    do{ \
+        (set_)->__bits[0] = 0; \
+    }while(0)
+
+#  define CPU_SET(cpu_,set_) \
+    do {\
+        size_t __cpu = (cpu_); \
+        if (__cpu < CPU_SETSIZE) \
+            (set_)->__bits[0] |= __CPU_MASK(__cpu); \
+    }while (0)
+
+#  define CPU_CLR(cpu_,set_) \
+    do {\
+        size_t __cpu = (cpu_); \
+        if (__cpu < CPU_SETSIZE) \
+            (set_)->__bits[0] &= ~__CPU_MASK(__cpu); \
+    }while (0)
+
+#  define CPU_ISSET(cpu_, set_) \
+    (__extension__({\
+        size_t  __cpu = (cpu_); \
+        (cpu_ < CPU_SETSIZE) \
+            ? ((set_)->__bits[0] & __CPU_MASK(__cpu)) != 0 \
+            : 0; \
+    }))
+
+#  define CPU_EQUAL(set1_, set2_) \
+    ((set1_)->__bits[0] == (set2_)->__bits[0])
+
+#  define __CPU_OP(dst_, set1_, set2_, op_) \
+    do { \
+        (dst_)->__bits[0] = (set1_)->__bits[0] op_ (set2_)->__bits[0]; \
+    } while (0)
+
+#  define CPU_COUNT(set_)  __builtin_popcountl((set_)->__bits[0])
+
+#else /* CPU_SETSIZE != __CPU_BITS */
+
+#  define CPU_ZERO(set_)          CPU_ZERO_S(sizeof(cpu_set_t), set_)
+#  define CPU_SET(cpu_,set_)      CPU_SET_S(cpu_,sizeof(cpu_set_t),set_)
+#  define CPU_CLR(cpu_,set_)      CPU_CLR_S(cpu_,sizeof(cpu_set_t),set_)
+#  define CPU_ISSET(cpu_,set_)    CPU_ISSET_S(cpu_,sizeof(cpu_set_t),set_)
+#  define CPU_COUNT(set_)         CPU_COUNT_S(sizeof(cpu_set_t),set_)
+#  define CPU_EQUAL(set1_,set2_)  CPU_EQUAL_S(sizeof(cpu_set_t),set1_,set2_)
+
+#  define __CPU_OP(dst_,set1_,set2_,op_)  __CPU_OP_S(sizeof(cpu_set_t),dst_,set1_,set2_,op_)
+
+#endif /* CPU_SETSIZE != __CPU_BITS */
+
+#define CPU_AND(set1_,set2_)   __CPU_OP(set1_,set2_,&)
+#define CPU_OR(set1_,set2_)    __CPU_OP(set1_,set2_,|)
+#define CPU_XOR(set1_,set2_)   __CPU_OP(set1_,set2_,^)
+
+/* Support for dynamically-allocated cpu_set_t */
+
+#define CPU_ALLOC_SIZE(count) \
+    __CPU_ELT((count) + (__CPU_BITS-1))*sizeof(__CPU_BITTYPE)
+
+#define CPU_ALLOC(count)   __sched_cpualloc((count));
+#define CPU_FREE(set)      __sched_cpufree((set))
+
+extern cpu_set_t* __sched_cpualloc(size_t count);
+extern void       __sched_cpufree(cpu_set_t* set);
+
+#define CPU_ZERO_S(setsize_,set_)  \
+    do { \
+        size_t __nn = 0; \
+        size_t __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
+        for (; __nn < __nn_max; __nn++) \
+            (set_)->__bits[__nn] = 0; \
+    } while (0)
+
+#define CPU_SET_S(cpu_,setsize_,set_) \
+    do { \
+        size_t __cpu = (cpu_); \
+        if (__cpu < 8*(setsize_)) \
+            (set_)->__bits[__CPU_ELT(__cpu)] |= __CPU_MASK(__cpu); \
+    } while (0)
+
+#define CPU_CLR_S(cpu_,setsize_,set_) \
+    do { \
+        size_t __cpu = (cpu_); \
+        if (__cpu < 8*(setsize_)) \
+            (set_)->__bits[__CPU_ELT(__cpu)] &= ~__CPU_MASK(__cpu); \
+    } while (0)
+
+#define CPU_ISSET_S(cpu_, setsize_, set_) \
+    (__extension__ ({ \
+        size_t __cpu = (cpu_); \
+        (__cpu < 8*(setsize_)) \
+          ? ((set_)->__bits[__CPU_ELT(__cpu)] & __CPU_MASK(__cpu)) != 0 \
+          : 0; \
+    }))
+
+#define CPU_EQUAL_S(setsize_, set1_, set2_) \
+    (__extension__ ({ \
+        __const __CPU_BITTYPE* __src1 = (set1_)->__bits; \
+        __const __CPU_BITTYPE* __src2 = (set2_)->__bits; \
+        size_t __nn = 0, __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
+        for (; __nn < __nn_max; __nn++) { \
+            if (__src1[__nn] != __src2[__nn]) \
+                break; \
+        } \
+        __nn == __nn_max; \
+    }))
+
+#define __CPU_OP_S(setsize_, dstset_, srcset1_, srcset2_, op) \
+    do { \
+        cpu_set_t* __dst = (dstset); \
+        const __CPU_BITTYPE* __src1 = (srcset1)->__bits; \
+        const __CPU_BITTYPE* __src2 = (srcset2)->__bits; \
+        size_t __nn = 0, __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
+        for (; __nn < __nn_max; __nn++) \
+            (__dst)->__bits[__nn] = __src1[__nn] op __src2[__nn]; \
+    } while (0)
+
+#define CPU_COUNT_S(setsize_, set_) \
+    __sched_cpucount((setsize_), (set_))
+
+extern int __sched_cpucount(size_t setsize, cpu_set_t* set);
+
+#endif /* _GNU_SOURCE */
+
 __END_DECLS
 
 #endif /* _SCHED_H_ */
diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index 9702a7a..35729ae 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/libc/include/sys/linux-syscalls.h
@@ -120,6 +120,8 @@
 #define __NR_sched_get_priority_max       (__NR_SYSCALL_BASE + 159)
 #define __NR_sched_get_priority_min       (__NR_SYSCALL_BASE + 160)
 #define __NR_sched_rr_get_interval        (__NR_SYSCALL_BASE + 161)
+#define __NR_sched_setaffinity            (__NR_SYSCALL_BASE + 241)
+#define __NR_sched_getaffinity            (__NR_SYSCALL_BASE + 242)
 #define __NR_uname                        (__NR_SYSCALL_BASE + 122)
 #define __NR_wait4                        (__NR_SYSCALL_BASE + 114)
 #define __NR_umask                        (__NR_SYSCALL_BASE + 60)
@@ -174,6 +176,7 @@
 #define __NR_getsockopt                   (__NR_SYSCALL_BASE + 295)
 #define __NR_sendmsg                      (__NR_SYSCALL_BASE + 296)
 #define __NR_recvmsg                      (__NR_SYSCALL_BASE + 297)
+#define __NR_getcpu                       (__NR_SYSCALL_BASE + 345)
 #define __NR_ioprio_set                   (__NR_SYSCALL_BASE + 314)
 #define __NR_ioprio_get                   (__NR_SYSCALL_BASE + 315)
 #define __NR_epoll_create                 (__NR_SYSCALL_BASE + 250)
@@ -218,6 +221,7 @@
 #define __NR_timer_delete                 (__NR_SYSCALL_BASE + 263)
 #define __NR_utimes                       (__NR_SYSCALL_BASE + 271)
 #define __NR_socketcall                   (__NR_SYSCALL_BASE + 102)
+#define __NR_getcpu                       (__NR_SYSCALL_BASE + 318)
 #define __NR_ioprio_set                   (__NR_SYSCALL_BASE + 289)
 #define __NR_ioprio_get                   (__NR_SYSCALL_BASE + 290)
 #define __NR_epoll_create                 (__NR_SYSCALL_BASE + 254)
@@ -276,6 +280,7 @@
 #define __NR_socketcall                   (__NR_SYSCALL_BASE + 102)
 #define __NR_socketcall                   (__NR_SYSCALL_BASE + 102)
 #define __NR___socketcall                 (__NR_SYSCALL_BASE + 102)
+#define __NR_getcpu                       (__NR_SYSCALL_BASE + 318)
 #define __NR_ioprio_set                   (__NR_SYSCALL_BASE + 288)
 #define __NR_ioprio_get                   (__NR_SYSCALL_BASE + 289)
 #define __NR_epoll_create                 (__NR_SYSCALL_BASE + 254)
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index 48c5c77..4a61724 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -53,7 +53,7 @@
 ssize_t          read (int, void*, size_t);
 ssize_t          write (int, const void*, size_t);
 ssize_t          __pread64 (int, void *, size_t, off_t, off_t);
-ssize_t          __pwrite64 (int, const void *, size_t, off_t, off_t);
+ssize_t          __pwrite64 (int, void *, size_t, off_t, off_t);
 int              __open (const char*, int, mode_t);
 int              __openat (int, const char*, int, mode_t);
 int              close (int);
@@ -183,6 +183,9 @@
 int              sched_get_priority_max (int policy);
 int              sched_get_priority_min (int policy);
 int              sched_rr_get_interval (pid_t pid, struct timespec *interval);
+int              sched_setaffinity (pid_t pid, size_t setsize, const cpu_set_t* set);
+int              __sched_getaffinity (pid_t pid, size_t setsize, cpu_set_t* set);
+int              __getcpu (unsigned *cpu, unsigned *node, void *unused);
 int              ioprio_set (int which, int who, int ioprio);
 int              ioprio_get (int which, int who);
 int              uname (struct utsname *);
@@ -205,7 +208,6 @@
 int              eventfd (unsigned int, int);
 int              __set_tls (void*);
 int              cacheflush (long start, long end, long flags);
-int              eventfd (int count, int flags);
 #ifdef __cplusplus
 }
 #endif