From cc38f9a8e6d51b2e96037375d338546cc606640d Mon Sep 17 00:00:00 2001
From: Alberto Ruiz <aruiz@um.es>
Date: Sun, 21 Dec 2014 12:07:38 +0100
Subject: temporary non thread safe randomVector workaround for OSX

---
 packages/base/src/C/vector-aux.c | 57 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

(limited to 'packages/base/src/C')

diff --git a/packages/base/src/C/vector-aux.c b/packages/base/src/C/vector-aux.c
index 54cc413..946d069 100644
--- a/packages/base/src/C/vector-aux.c
+++ b/packages/base/src/C/vector-aux.c
@@ -700,6 +700,61 @@ int saveMatrix(char * file, char * format, KDMAT(a)){
 
 ////////////////////////////////////////////////////////////////////////////////
 
+#ifdef OSX
+
+#pragma message "randomVector is not thread-safe in OSX"
+
+double gaussrand(int *phase, double *pV1, double *pV2, double *pS)
+{
+	double V1=*pV1, V2=*pV2, S=*pS;
+	double X;
+
+	if(*phase == 0) {
+		do {
+            double U1 = (double)random() / (double)RAND_MAX;
+			double U2 = (double)random() / (double)RAND_MAX;
+
+			V1 = 2 * U1 - 1;
+			V2 = 2 * U2 - 1;
+			S = V1 * V1 + V2 * V2;
+			} while(S >= 1 || S == 0);
+
+		X = V1 * sqrt(-2 * log(S) / S);
+	} else
+		X = V2 * sqrt(-2 * log(S) / S);
+
+	*phase = 1 - *phase;
+    *pV1=V1; *pV2=V2; *pS=S;
+
+	return X;
+
+}
+
+int random_vector(unsigned int seed, int code, DVEC(r)) {
+    int phase = 0;
+    double V1,V2,S;
+    
+    int k;
+    switch (code) {
+      case 0: { // uniform
+        for (k=0; k<rn; k++) {
+            rp[k] = (double)random() / (double)RAND_MAX;
+        }
+        OK
+      }
+      case 1: { // gaussian
+        for (k=0; k<rn; k++) {
+            rp[k] = gaussrand(&phase,&V1,&V2,&S);
+        }
+        OK
+      }
+
+      default: ERROR(BAD_CODE);
+    }
+}
+
+#else
+
 inline double urandom(struct random_data * buffer) {
     int32_t res;
     random_r(buffer,&res);
@@ -766,6 +821,8 @@ int random_vector(unsigned int seed, int code, DVEC(r)) {
     }
 }
 
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 
 int smXv(KDVEC(vals),KIVEC(cols),KIVEC(rows),KDVEC(x),DVEC(r)) {
-- 
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