Changeset dd46fd3 for libcfa/src/concurrency/kernel

Timestamp:

Nov 30, 2022, 10:36:25 PM (3 years ago)

Author:

Peter A. Buhr <pabuhr@…>

Branches:

ADT, ast-experimental, master

Children:

5657de9, c8238c0

Parents:

be1d00c

Message:

generalization of PRNG

Location:

libcfa/src/concurrency/kernel

Files:

• fwd.hfa (modified) (3 diffs)
• startup.cfa (modified) (3 diffs)

libcfa/src/concurrency/kernel/fwd.hfa

@@ -46 +46 @@
                         } preemption_state;
 
-                        #if defined(__SIZEOF_INT128__)
-                                __uint128_t rand_seed;
-                        #else
-                                uint64_t rand_seed;
-                        #endif
+                        PRNG_STATE_T random_state;
+
                         struct {
                                 uint64_t fwd_seed;
@@ -57 +54 @@
 
                         struct __stats_t        * volatile this_stats;
-
 
                         #ifdef __CFA_WITH_VERIFY__
@@ -76 +72 @@
                 #define publicTLS_get( member ) ((typeof(__cfaabi_tls.member))__cfatls_get( __builtin_offsetof(KernelThreadData, member) ))
 
-                static inline uint64_t __tls_rand() {
-                        return
-                        #if defined(__SIZEOF_INT128__)
-                                lehmer64( kernelTLS().rand_seed );
-                        #else
-                                xorshift_13_7_17( kernelTLS().rand_seed );
-                        #endif
+                static inline
+                        #ifdef __x86_64__                                                       // 64-bit architecture
+                        uint64_t
+                        #else                                                                           // 32-bit architecture
+                        uint32_t
+                        #endif // __x86_64__
+                __tls_rand() {
+                        return PRNG_NAME( kernelTLS().random_state );
                 }
 

libcfa/src/concurrency/kernel/startup.cfa

@@ -108 +108 @@
 extern void __wake_proc(processor *);
 extern int cfa_main_returned;                                                   // from interpose.cfa
-PRNG_ARG_T __global_random_prime = 4_294_967_291u;
+size_t __global_random_prime = 4_294_967_291u;
 bool __global_random_mask = false;
 
@@ -135 +135 @@
 // Global state
 __thread struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= {
-        NULL,                                                                                           // cannot use 0p
-        NULL,
-        false,
-        { 1, false, false },
-        0,
-        { 0, 0 },
-        NULL,
+        .this_thread : NULL,                                                            // cannot use 0p
+        .this_processor : NULL,
+        .sched_lock : false,
+        .preemption_state : { .disable_count : 1, .enabled : false, .in_progress : false },
+        // random_state uninitialized
+        .ready_rng : { .fwd_seed : 0, .bck_seed : 0 },
+        .this_stats : NULL,
         #ifdef __CFA_WITH_VERIFY__
-                false,
-                0,
+                .in_sched_lock : false,
+                .sched_id : 0,
         #endif
 };
@@ -521 +521 @@
         preferred = ready_queue_new_preferred();
         last_proc = 0p;
-        random_state = __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl();
+        PRNG_SET_SEED( random_state,  __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl() );
         #if defined( __CFA_WITH_VERIFY__ )
                 executing = 0p;